SIKLUS SULFUR MAKALAH Diajukan Sebagai Tugas Mata Kuliah Rekayasa Lingkungan dengan Dosen Pengamu Adi !hand"a M#$ S#T
Disusun %leh RIS&A'DI
()*+(((+*,
FA-AR ADIT.A R/'ATA
()*+(((+(,
PR%0RAM STUDI T/K'IK SIPIL FAKULTAS ILMU SAI'S DA' T/K'%L%0I U'I1/RSITAS MUHAMMADI.AH SUKA2UMI 3+(4
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1
KATA KATA P/'0A'TAR P/'0 A'TAR Puji Pu ji syuku syukurr saya saya haturk haturkan an kepad kepada a Tuhan uhan Yang Maha Maha Esa, Esa, atas atas Rahma Rahmatt dan Karun Karuniaia-Nya Nya sehing sehingga ga saya saya dapat dapat menyel menyelesa esaik ikan an tugas tugas Makalah sederhana yang berjudul ”!K"# #"$#R” dengan baik% Makala Makalah h ini merupa merupaka kan n salah salah satu satu tugas tugas mata mata kulia kuliah h Rekayas ekayasa a "ingkunga "ingkungan% n% elain elain itu tujuan tujuan dari penyusunan penyusunan Makalah Makalah ini juga untuk untuk menambah &a&asan tentang pengetahuan siklus sul'ur se(ara meluas% ehingga besar harapan kami, Makalah yang kami sajikan dapat menjadi k)nstr k)nstribus ibusii p)siti' p)siti' bagi pengemban pengembang g &a&asan &a&asan pemba(a pemba(a dan bis bisa a lebih lebih baik lagi dalam penyusunan Makalah yang selanjutnya% aya menyadari bah&a dalam penyusunan Makalah sederhana ini masih jauh dari sempurna% *leh karena itu, saya mengharapkan saran dan krit kritik ik yang yang memb memban angu gun n
demi demi kesem esempu purn rnaa aan n
sederhana yang akan datang%
DAFTAR DAFTAR ISI IS I
peny penyus usun unan an Maka Makala lah h
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+
KT KT PENNTR%%%%%%%%%%%%%%%% PENNTR%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%% i .$TR .$TR !!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% !!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%ii ii // ! PEN.0#"#N%%%%%%%%%%%%%% PEN.0#"#N%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% 1 1%1
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Pengertian Pengertian ul'ur%%%%%%%%%%%%%%%%%%%%%%%%%%%% ul'ur%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%% 2
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// !!! PEN#T#P%%%%%%%%%%%%%%%%%%%%%%%%% PEN#T#P%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%13 13 %1
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1
2A2 I P/'DAHULUA' (#(
Lata" 2e 2elakang Ek)l)gi biasanya dide5nisikan sebagai ilmu tentang interaksi antara
)rga )rgan nisme isme - )rga )rgani nism sme e
dan dan
ling lingk kunga ungann nnya ya%%
/erb /erbag agai ai
ek)s ek)sis iste tem m
dihubungkan satu sama lain )leh pr)ses-pr)ses bi)l)gi, kimia, dan 5sika% Masukan dan buangan energi, gas, bahan kimia an)rganik dan )rganik dapat mele&ati batasan ek)sistem melalui perantara 'akt)r mete)r)l)gi seperti angin dan presipitasi, 'akt)r ge)l)gi seperti air mengalir dan daya tarik dan 'akt)r bi)l)gi seperti gerakan he&an% 6adi, keseluruhan bumi itu sendiri adalah ek)sistem, dimana tidak ada bagian yang teris)lir dari yang lain% Ek)sistem keseluruhannya biasanya disebut bi)s'er% /i)s'er terdiri dari semua )rganisme hidup dan lingkungan bi)s'er membentuk 7shell” 8kulit9, relati' tipis di sekeliling bumi, berjarak hanya beberapa mil di atas dan di ba&ah permukaan air laut% Ke(uali energi, bi)s5r sudah bisa men(ukupi dirinya sendiri, semua persyaratan hidup yang lain seperti air, )ksigen, dan hara dipenuhi )leh pemakaian dan daur ulang bahan yang telah ada dalam sistem tersebut% Materi yang menyusun tubuh )rganisme berasal dari bumi% Materi yang berupa unsur-unsur unsur-unsur terdapat dalam senya&a kimia yang merupakan materi dasar makhluk hidup dan tak hidup% iklus bi)ge)kimia atau siklus )rganikan)rganik adalah siklus unsur atau senya&a kimia yang mengalir dari k)mp)nen abi)tik ke bi)tik dan kembali lagi ke k)mp)nen abi)tik% iklus unsur-unsur tersebut tidak hanya melalui )rganisme, tetapi juga melibatkan reaksi-reaksi kimia dalam lingkungan abi)tik%
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+
#nsur-unsur #nsur-unsur kimia tersebut atau yang umum disebut materi diman'aatkan pr)duse pr)dusen n untuk untuk membentuk membentuk bahan bahan )rganik )rganik dengan dengan bantuan bantuan matahari matahari atau energi yang berasal dari reaksi kimia% /ahan )rganik yang dihasilkan merupakan sumber energi bagi )rganisme% Pr)ses makan dan dimakan pada rantai makanan mengakibatkan aliran materi dari mata rantai yang satu ke mata rantai yang lain% ;alaupun mahluk hidup dalam satu rantai makana makanan n mati, mati, aliran aliran materi materi akan akan tetap tetap berlan berlangs gsung ung terus terus%% Karena Karena mahluk yang mati tersebut diurai )leh dek)mp)ser yang akhirnya akan masuk lagi ke rantai makanan berikutnya% .emikian interaksi ini terjadi se(ara terus menerus sehingga membentuk suatu aliran energi dan daur materi% Mahluk hidup, terutama tumbuhan ikut mendapat pengaruh yang (ukup (ukup signi5ka signi5kan n dari suplai hara dan energi% energi% .i alam, alam, semua semua elemenelemenelemen kimia&i dapat masuk dan keluar dari sistem untuk menjadi mata rantai siklus yang lebih luas dan bersi'at gl)bal% Namun demikian ada suatu suatu ke(end ke(enderun erungan gan sejumlah sejumlah elemen elemen beredar beredar se(ara se(ara terus terus menerus menerus dalam ek)sistem dan men(iptakan suatu siklus internal% iklus ini dikenal sebagai sebagai siklus siklus bi)ge)kim bi)ge)kimia ia karena karena pr)sesn pr)sesnya ya menyangk menyangkut ut perpinda perpindahan han k)mp)nen bukan jasad 8ge)9, ke k)mp)nen jasad 8bi)9 dan kebalikannya% iklus iklus bi)ge) bi)ge)kim kimia ia pada pada akhir akhirnya nya (ender (enderung ung mempun mempunyai yai mekan mekanism isme e umpan-balik yang dapat mengatur sendiri 8sel' regulating9 yang menjaga siklus itu dalam keseimbangan% alah alah satu satu siklu siklus s bi)ge bi)ge)ki )kimi mia a yakni yakni siklus siklus sul'ur sul'ur%% Kita Kita tahu tahu jika jika sul'ur sul'ur lebih lebih dikenal dikenal masyarak masyarakat at dengan dengan belerang belerang yang terkandu terkandung ng di dalam sumber mata air panas% .i sisi lain, siklus sul'ur memiliki peran penting dalam pr)ses aliran energi dan materi yang terjadi di alam% elain itu
siklus
sul'ur
juga
memiliki
banyak
pengaruh
terhadap
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/erdasarakan hal tersebut kami men()ba memaparkan pr)ses dari siklus sul'ur, peran manusia dalam siklus sul'ur serta dampak siklus sul'ur terhadap keberlangsungan kehidupan makhluk hidup%
(#3
Rumusan Masalah Masala Masalah-m h-masa asalah lah yang yang akan akan kami kami bahas bahas dalam dalam karya karya ilmiah ilmiah ini
meliputi< 1% +% % 2%
(#*
pa itu bakteri sul'ur= /agai agaima man na pr)ses )ses ter terjad jadinya inya siklu klus sul' ul'ur = /agaimana peran manusia dlm siklus sul'ur > hujan asam = pa p a dam dampa pak k dan dan 'ung 'ungsi si adan adanya ya bakt bakter erii sul sul'u 'urr di tana tanah= h=
Tujuan Tujuan Tujuan se(ara umum adalah<
1% #ntuk #ntuk mengetahui mengetahui siklus sul'ur sul'ur dan mikr))r mikr))rgani ganisme sme yang berperan berperan didalamnya% +% #ntuk #ntuk mengetahui mengetahui pengaruh pengaruh sul'ur sul'ur terhada terhadap p lingkung lingkungan% an% % #ntuk #ntuk mengetahui mengetahui man'aat man'aat sul'ur sul'ur bagi )rganism )rganisme e hidup lainnya% lainnya%
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2
P/M2AHASA' 3#(
Penge"tian Sul5u" /elerang ? sul'ur ialah unsur kimia dalam tabel peri)dik yg memiliki
lambang > n)m)r at)m 1@% /entuknya ialah n)n-metal yg tak berasa, tak berbau > multiAalent% /elerang, dlm &ujud aslinya, ialah sebuah Bat padat kristalin kuning% .i alam, belerang bisa diketemukan sebagai unsur murni ? sebagai mineral- mineral sul5de > sul'ate% !a ialah unsur penting buat kehidupan > diketemukan dlm &ujud senya&a asam amin) unit ke(il dari pr)tein% Pr)tein ini penting pertumbuhan % ul'ur terdapat dlm &ujud sul'ur an)rganik, sul'ur direduksi karena bakter bakterii menjad menjadii sul5d sul5da a > kadan kadang-k g-kada adang ng terdap terdapat at dlm &ujud &ujud sul'u sul'urr di)ksida di)ksida ? hidr)gen hidr)gen sul5da% sul5da% 0idr)gen 0idr)gen sul5da ini seringk seringkali ali mematika mematikan n mahluk mahluk diperair diperairan an > pada umumnya dihasilk dihasilkan an dari penguraian penguraian bahan bahan )rgan )rganik ik yg mati% mati% Tumbuha umbuhan n menyer menyerap ap sul'u sul'urr dlm &ujud &ujud sul'a sul'att 8* 29% Perp Perpind indaha ahan n sul'at sul'at terjad terjadii le&at le&at pr)se pr)ses s ranta rantaii makana makanan, n, lalu lalu semua semua mahluk hidup mati > mau diuraikan k)mp)nen k)mp)nen )rganiknya karena bakteri% /eberapa
jenis
bakteri
diantaranya Desulfomaculum >
terlibat
dlm
.esulbrio yg
mau mau
daur mered eredu uksi ksi
sul'ur, sul'at l'at
menjadi sul5de dlm &ujud hydr)gen sul5de 80 +9 lalu 0+ diberdayakan bakteri ')t)aut)tr)' anaer)b seperti :hr)matium > melepaskan sul'ur >
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3
.aur tipe sedimen (enderung buat lebih minus sempurna > lebih gampang gampang digangg diganggu u karena karena gangguan gangguan setempat setempat sebab sebab sebagian sebagian besar besar bahan terdapat dlm tempat > relati' tak akti' > tak bergerak di dlm kulit bumi bumi%% 0asi 0asiln lnya ya,, bebe bebera rapa pa bagi bagian an dari dari baha bahan n yg bisa bisa dipe dipert rtuk ukar arka kan n (enderung ” hilang” buat &aktu yg lama apabila gerakan menurunnya jauh lebih (epat (epat dari pada gerakan gerakan 7naik” 7naik” kembali% etiap etiap daur melibatkan melibatkan unsur )rganisme buat membantu menguraikan senya&a-senya&a menjadi unsur-unsur%
3#3 3#3
P"os P"oses es Te"ja e"jadi diny nya a Sik Siklu lus s Sul Sul5u 5u" " iklus sul'ur ? daur belerang ialah perubahan sul'ur dari hidr)gen
sul5d sul5da a menjad menjadii sul'u sul'urr di)ksi di)ksida da lalu lalu menjad menjadii sul'at sul'at > kembali embali menjad menjadii hidr)gen sul5da lagi% ul'ur di alam diketemukan dlm aneka &ujud% .lm tanah tanah dikete diketemuk mukan an dlm &ujud &ujud miner mineral, al, diudar diudara a dlm &ujud &ujud gas sul'u sul'urr di)ksida, > dlm tubuh )rganisme sebagai penyusun pr)tein% iklus sul'ur didahului karena pembentukan sul'ur dari kerak bumi > atm)s' atm)s'er er%% e(ara e(ara alami, alami, sul'ur sul'ur terka terkandu ndung ng di dlm tanah tanah dlm &ujud &ujud mineral tanah% .imana kerak bumi umumnya mengandung sekitar C,C@D belerang% belerang% ul5da-s ul5da-sul5d ul5da a l)gam l)gam terdapat terdapat dlm bebatuan bebatuan plut)nik plut)nik,, yaitu batuan yg membeku di dlm kerak bumi > tak men(apai ke permukaan bumi% /ebatuan plut)nik ini apabila han(ur > mengalami pelapukan mau
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@
uap air hujan sehingga gas tersebut berubah menjadi sul'at yg jatuh di tana tanah, h, sung sungai ai > laut lautan an%% .ima .imana na tana tanah h yg meng mengan andu dung ng berl berlim impa pah h belera belerang ng ialah ialah tanahtanah-tan tanah ah berpas berpasir ir > tanahtanah-tan tanah ah yg (ukup (ukup tingg tinggii kandungan )ksida $e > l seperti mineral Pirit 8$e9 > rendah kandungan bahan bahan )rgan )rganik% ik% edang edangka kan n pr)du pr)duksi ksi sul'a sul'att le&at le&at dek)mp dek)mp)s )sisi isi bahan bahan )rganik berupa pr)tein > senya&a )rganik lainnya yg mau menghasilkan senya&a-senya&a sederhana berupa 0 + > sul5da 8 +9 yg jika ter)ksidasi mau menjadi sul'at 8* 2-+9% Tumbuhan Tumbuhan lalu menyerap sul'at 8* 2-+9 yg mengendap pada tanah, tanah, sungai, > lautan% .i dlm tubuh tumbuhan, sul'ur diberdayakan sebagai bahan penyusun pr)tein% 0e&an > manusia mendapatkan sul'ur dgn jalan memakan tumbuhan yg jg diman'aatkan diman'aatkan sebagai energi (adangan berupa pr)te pr)tein% in% 6ika 6ika tumbuh tumbuhan an > he&an he&an mati, mati, jasad jasad renik renik 8dek 8dek)mp )mp)se )ser9 r9 mau menguraikannya menguraikannya menjadi gas berbau busuk yakni 0 + > sul5da 8 +9% iklus sul'ur di semenjak dari dlm tanah, yaitu ketika i)n-i)n sul'at diserap diserap karena karena akar > di metab)lis metab)lisme me menjadi menjadi penyusun penyusun pr)tein pr)tein dlm tubuh tumbuhan, ketika he&an > manusia memakan tumbuhan, pr)tein terseb tersebut ut mau berpi berpinda ndah h ke tubuh tubuh manus manusia% ia% .ari .ari dlm tubuh tubuh manusi manusia a senya&a sul'ur mengalami metab)lisme yg sisa-sisa hasil metab)lisme tersebut diuraikan karena bakteri dlm lambung berupa gas > dikeluarkan
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4
mau dis diserap erap kembali kembali karena tanaman sedangk sedangkan an sul'ur sul'ur di)ksida di)ksida mau bereaksi dgn )ksigen > air membentuk asam sul'at 80 +*29 yg lalu jatuh ke bumi dlm &ujud hujan asam% 0ujan asam jg bisa dikarenakan )elh p)lusi udara seperti asap-asap pabrik, pembakaran kendaraan berm)t)r, dll% dll% 0ujan 0ujan asam asam bis bisa a menjad menjadii penyeb penyebab ab k)r) k)r)si si batubatu-bat batua uan n > l)gam% l)gam% 0+*2yg jatuh jatuh kedalam kedalam tanah karena karena bakteri dipe(ah lagi menjadi menjadi i)n sul'at yg kembali diserap karena tumbuhan, tumbuhan di makan karena he&a he&an n
> manu manusi sia, a, makh makhlu luk k
hidu hidup p
mati mati diur diurai aika kan n
kar karena ena
bakt bakter erii
mengha menghasi silk lkan an sul'u sul'urr kembali embali%% /egitu /egitu seteru seterusny snya% a% iklu iklus s sul'u sul'urr ? daur daur belerang tak mau pernah terhenti selama salah satu k)mp)nen penting seperti tumbuhan masih ada di permukaan bumi ini% .lm daur daur sul'ur sul'ur ? daur daur belera belerang, ng, buat buat meruba merubah h sul'u sul'urr menjad menjadii senya&a senya&a belerang belerang lainnya lainnya setidakn setidaknya ya ada dua jenis jenis pr)ses pr)ses yg terjadi% terjadi% Yaitu Yaitu le&at reaksi antara sul'ur, )ksigen, > air serta karena aktiAitas mikr))rganisme% /eberapa mikr))rganisme yg berperan dlm siklus sul'ur diantara diantaranya nya ialah ialah bakteri bakteri Desulfomaculum > bakter bakterii Desulbrio yg mau mau mereduksi sul'at menjadi sul5da dlm &ujud hidr)gen sul5da 80 +9% "alu 0+ diberda diberdayaka yakan n karena karena bakteri bakteri ')t)aut)t ')t)aut)tr)' r)' anaer)b anaer)b 8 Chromatium) > melepa melepask skan an sul'u sul'urr serta serta )ksige )ksigen% n% "alu "alu sul'ur sul'ur di)ksi di)ksidas dasii yg terben terbentuk tuk diubah menjadi sul'at karena bakteri kem)lititr)' 8 Thiobacillus 9%
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G
2% enya&a *rganik * 2-+ H 0+, masing-masing mikr))rganisme
heter)tr)' aer)bik dan anaer)bik Pr)ses rantai makanan dijuluki-sebut dijuluki-sebut sebagai pr)ses perpindahan perpindahan sul'a sul'at, t, yg selanj selanjutn utnya ya ketika etika semua semua mahluk mahluk hidup hidup mati mati > nanti nanti mau diuraikan karena k)mp)nen )rganiknya yakni bakteri% /eberapa bakteri yg terlibat
dlm
pr)ses
daur
belerang
8sul'ur9
ialah Desulbrio > Desulfomaculum yg nantinya mau berperan mereduksi sul'at menjadi sul5da dlm &ujud 80 +9 ? hidr)gen sul5da% ul5da sendiri nantinya mau diman'aatkan karena bakteri $)t)aut)tr)' anaer)b seperti haln halnya ya
:hr :hr)mat )matiu ium m
kem)lit)tr)'
>
seperti
mele melepa pask skan an
sul' su l'ur ur
sert serta a
halnya Thiobacillus yg
)ks )ksigen igen%%
/akt /akter erii
akhirnya
mau
meng)ksidasi menjadi &ujud sul'at% Pada Pada alira aliran n energ energii lebih lebih diteka ditekank nkan an pada pada perput perputara aran n energ energii yg terjadi diantara k)mp)nen ek)sistem% iklus energi ini dia&ali dari energi matahari yg ditangkap karena pr)dusen, lalu terus berputar tiada henti pada k)nsumen > semua k)mp)nen ek)sistem yg% hal ini karena menurut huk hukum term term)d )din inam amik ika a bah& bah&a a ener energi gi bisa bisa beru beruba bah h &uju &ujud, d, tak tak bisa bisa dimusnahkan serta di(iptakan% Perubahan &ujud energi ini dikenal dgn istila istilah h trans trans')r ')rmas masii energ energi% i% lira liran n energ energii di alam alam ? ek)si ek)siste stem m tundu tunduk k kepada hukum-hukum term)dinamika tersebut%
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I
sul'ur me&ujudkan?adalah k)mp)nen penting asam-asam amin) esensial penyusun pr)tein tanaman maupun he&an, seperti methi)nin, sistein, > sistin, sistin, jg dlm pembentuk pembentukan an p)lipept p)lipeptida% ida% ;alaupun alaupun sul'ur sul'ur tak berperan berperan langs langsung ung dlm pemben pembentuk tukan an energ energii 8TP9 8TP9 seper seperti ti ph)sp ph)sp)r, )r, tapi tapi sul'u sul'urr berperan berperan dlm sintesis sintesis pr)tein% pr)tein% .imana .imana pr)tein pr)tein nantinya nantinya mau dir)mba dir)mbak k menjad menjadii karb karb)nh )nhidr idrat at jika jika Bat makana makanan n pengha penghasil sil energ energii utama utama tak men(ukupi% 1tu sebabnya mengapa pr)tein berperan sebagai penghasil energi% Ketika he&an > tumbuhan mati, dek)mp)ser seperti bakteri mau menguraikan menguraikan tubuh makhluk hidup tersebut menjadi gas 0 +% /ebe /ebera rapa pa
bakt bakter erii
anae anaerr)b
mela melak kukan ukan
kem)s em)sin inte tesi sis% s% .ima .imana na
kem)sin kem)sintesi tesis s me&ujudk me&ujudkan?a an?adala dalah h pr)ses pr)ses pembentu pembentukan kan senya&a senya&a bahan bahan )rganik dari Bat-Bat an)rganik dgn meman'aatkan energi yg berasal dari reaksi-reaksi kimia% Pada kem)sintesis elektr)n d)n)r berasal dari bahan an)rgani an)rganik k sedehana sedehana,, misalnya misalnya hidr)gen hidr)gen,, nitrgen, nitrgen, besi > sul'ur sul'ur%% elama elama
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1C
hasil dari peng)ksidasian mineral sul5da 8batuan plut)nik9, berikut ialah misalnya misalnya persamaa persamaan n reaksi reaksi pembentu pembentukan kan sul'at sul'at le&at le&at )ksidasi )ksidasi mineral mineral sul5da, misalnya mineral besi sul5da% + $e+ H 4 *+ H + 0+*
+ $e $e+HH 2 *2+- H 2 0H
→
Pr)ses kimia jg terjadi ketika gas * + terbentuk le&at pembakaran hasil emisi pembakaran gas belerang ? aktiAitas gunung berapi% Persamaan reaksinya< 8s9 H * + 8g9
→
*+ 8g9
Pr)se Pr)ses s kimia kimia jg terjad terjadii ketika etika gas 0 + terbentuk terbentuk le&at le&at aktiAitas aktiAitas bi)l)gis ketika bakteri mengurai bahan )rganik dlm keadann tiada )ksigen 8aktiAitas anaer)bik9, seperti di ra&a, > saluran pembuangan k)t)ran% as ini jg mun(ul pada gas yg mun(ul dari aktiAitas gunung berapi > gas
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11
diberda diberdayaka yakan n buat mendapatk mendapatkan an hidr)gen hidr)gen%% !a tersusun tersusun dari tiga reaksi reaksi kimia yg t)tal reaktannya ialah air > t)tal pr)duknya ialah hidr)gen > )ksigen%
+ 0+*2 + *+ H + 0+* H *+
!+ H *+ H + 0+* + 0! H 0 +*2
+ 0! !+ H 0+
enya&a enya&a sul'ur sul'ur > i)din i)din didaur didaur > diberda diberdayaka yakan n ulang% ulang% Pr)ses Pr)ses ini
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1+
kimia di udara bisa pindah ke darat misalnya le&at hujan J darat ke udar udara a J dara daratt ke air air J air air ke dara daratt dll dll kar karena ena pela pelapu puka kan, n, er)s er)si, i, pengendapan % Yg tentu semua 1tu pasti buat suatu keseimbangan 2% ul'u ul'urr terdap terdapat at dlm dlm &ujud &ujud sul'a sul'att an)rg an)rgani anik% k% ul'ur ul'ur diredu direduks ksii kare karena na bakteri menjadi sul5da > kadang-kadang terdapat dlm &ujud sul'ur di)ksida ? hidr)gen sul5da% 0idr)gen sul5da ini seringkali mematikan mahluk hidup di perairan > pada umumnya dihasilkan dari penguraian bahan )rganik yg mati%
3#* 3#*
Pe"a Pe"an n Man Manus usia ia dan dan Huja Hujan n Asa Asam m Manusia jg berperan dlm siklus sul'ur% 0asil pembakaran pabrik yg
merupakan akti5tas manusia memba&a sul'ur ke atm)s'er% Ketika hujan terjadi, turunlah hujan asam yg memba&a 0 +*2 kembali ke tanah% 0al ini bisa menyebabkan perusakan batuan jg tanaman%
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1
terba&a terba&a angin angin hingga hingga ratusan ratusan kil)meter kil)meter di atm)s'er atm)s'er sebelum sebelum berubah berubah menjadi asam > terdep)sit ke tanah% 0ujan asam bisa terbentuk dari pr)ses reaksi gas yg mengandung sul'at% ul'at di)ksida 8* +9 yg bereaksi dgn *ksigen 8* +9 dgn bantuan dari sinar ultraAi)let yg berasal dari sinar matahari%
3#) 3#)
Man5 Man5aa aatt dan dan Fungs ungsii 2ak 2akte te"i "i Sul5 Sul5u" u" #dara #dara yg ter(em ter(emar ar ul' ul'ur ur *ksi *ksida da 8 *+9 meny menyeb ebab abka kan n manu manusi sia a
mengal mengalami ami ganggu gangguan an pada pada sis sistem tem perna' perna'asa asanny nnya% a% 0al ini karena karena gas *+ yg gampang menjadi asam tersebut menyerang selaput lendir pada hidung hidung,, tengg) tengg)r) r)ka kan, n, > salur saluran an na'as na'as yg lain lain hingga hingga ke paru-p paru-par aru% u% erangan erangan gas *+ tersebut tersebut menyebabk menyebabkan an iritasi iritasi pada bagian bagian tubuh tubuh yg terkena% Pengaruh utama p)lutan * terhadap manusia ialah iritasi sistem
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12
hyper plasia > meta plasia sel-sel epitel > di(urigai bisa menjadi kanker% ul' ul'ur ur
di)Li i)Lide de
8*+ 8*+99
memi memili liki ki
(ak (akupan upan-( -(ak akup upan an
yg
sang sangat at
mengganggu% 6ika kita menghirup *+ hanya menembus sejauh hidung > tengg)r) tengg)r)kan kan kian sejumlah sejumlah ke(il ke(il k)nsen k)nsentras trasii *+ mau men(apai men(apai paruparuparu% kan tetapi jika menghirup se(ara berat dlm artian ada di l)kasi gas belera belerang ng dlm &aktu &aktu yg lama, lama, maka maka berna bernapas paslah lah hanya hanya le&at le&at mulut mulut karena karena k)nsentras k)nsentrasii dari *+ akan akan menjadi menjadi (ukup (ukup tinggi% tinggi% E'ek dari gas belerang terhadap manusia sangatlah berAariasi% .imana dgn k)nsentrasi k)nsentrasi
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13
.lm kehidupan, sul'ur ? belerang berperan dlm< 1% Mens Mensta tabi bilk lkan an stru strukt ktur ur pr)t pr)tei ein% n% !kat !katan an sul5 sul5da da sang sangat at pent pentin ing g yait yaitu u untuk membentuk pr)tein stabil% +% /erperan /erperan dlm mengakti' mengakti'kan kan enBim, enBim, karena karena aneka enBim enBim membutuhk membutuhkan an gugus sul'urhidril sul'urhidril 8-09 yg bebas, buat melakukan aktiAasinya% .engan demikian
sul'ur
berperan
dlm
pr)ses
)ksidasi-reduksi
?
perna'asan jaringan% % /erp /erper eran an dlm dlm meta metab) b)li lism sme e ener energi gi dgn dgn (ara (ara memb memben entu tuk k seny senya& a&a a
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1@
*#(
Kesimulan alah satu siklus kimia yg penting ialah siklus sul'ur% danya siklus
sul'ur membuat ketersediaan sul'ur di bumi tetap terjaga% iklus sul'ur terjadi dlm suatu rantai makanan, yg dimulai dari tumbuhan% .i dlm tubuh tumbuh tumbuhan an belera belerang ng dari dari dlm dlm tanah tanah diber diberday dayaka akan n sebag sebagai ai penyus penyusun un pr)tein% 0e&an > manusia mendapatkan belerang dgn jalan memakan tumbuhan%
6ika
tumbuhan
>
he&an
mati,
jasad
renik
menguraikannya lagi menjadi gas yg mengandung unsur sul'ur%
mau
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14
% 0+ *2-+ 8Peng)ksidasi sul5de aer)bik9F bakteri kem)lit)tr)' <
bakteri Thiobacilli% 2% enya&a *rganik * 2-+ H 0+, masing-masing mikr))rganisme
heter)tr)' aer)bik dan anaer)bik Manusia juga berperan dalam siklus sul'ur% 0asil pembakaran pabrik yang merupakan akti5tas manusia memba&a sul'ur ke atm)s'er% Ketika hujan hujan terjad terjadi, i, turun turunlah lah hujan hujan asam asam yang yang memba& memba&a a 0 +*2 kembali kembali ke
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1G
http?kumpulan-askep%()m?bl)g?makalah-siklus-sul'ur-2+I@3?