Chrome Flesh pdf for those that would like to use it for their SR5 games.Description complète
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Chrome Flesh pdf for those that would like to use it for their SR5 games.
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Chrome Flesh pdf for those that would like to use it for their SR5 games.
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Analysis of David Sokol's trades leading up to his resignation from Berkshire Hathaway, and his potential violations of certain CFA standards.
1
WP Maintenance
1.2 Chrome Solution Analysis Procedures
09/26/95 09/26/95
SERVICE LABORATORYWORK INSTRUCTIONS B.F. 1 B. FARKAS QLWI 4.10.53 DETERMINATION OF CHROMIC ACID
Purpose:
To describe the steps to be taken to determine the concentration of chromic acid in chromium plating solutions.
Reagents:
Distilled Water Ammonium Bifluoride crystals Concentrated Hydrochloric Acid 20% Potassium Iodide Solution-(200g/l + 1 g/l Potassium Hydroxide ) 0.10 N Sodium Thiosulfate Standard Solution Starch Indicator
Procedure:
1)
Pipette a 2 ml sample into a 100 ml volumetric flask, dilute to volume with distilled water and mix.
2)
Pipette 10 ml of this dilution into a 250 ml Erlenmeyer flask.
3)
Dilute with distilled water to between 100 and 125 ml.
4)
Add one scoop of ammonium bifluoride crystals and 15 ml of concentrated hydrochloric acid.
5)
Add 5 ml of 20% potassium iodide solution.
6)
Titrate with 0.10 N sodium thiosulfate standard solution to a straw colour, add 5 ml of starch indicator and continue titration until the blue colour disappears.
Calculation Chromic Acid ( g/l )
=
( ml 0.10 N Sodium Thiosulfate titrated ) x 16.725
SERVICE LABORATORY WORK INSTRUCTIONS
09/26/95 09/26/95
B.F. QLWI 4.10.54
1 of 2 B. FARKAS
DETERMINATION OF TRIVALENT CHROMIUM
Purpose:
To describe the steps to be taken to determine the concentration of trivalent chromium in chromium plating solutions.
Reagents:
Distilled Water Ammonium Bifluoride crystals Concentrated Hydrochloric Acid 20% Potassium Iodide Solution- (200g/l + 1 g/l Potassium Hydroxide) Sodium Peroxide 0.10 N Sodium Thiosulfate Standard Solution Starch Indicator Boiling Chips
Procedure:
1)
Pipette a 2 ml sample into a 100 ml volumetric flask, dilute to volume with distilled water and mix.
2)
Pipette 10 ml of this dilution into a 250 ml Erlenmeyer flask.
3)
Dilute with distilled water to between 100 and 125 ml.
4)
Add about 1/2 gram of sodium peroxide and some boiling chips.
5)
Place on the hot plate and boil for between 20 and 30 minutes.
6)
Remove from hot plate and dilute to between 100 and 125 ml with distilled water and allow to cool.
7)
Add one scoop of ammonium bifluoride crystals and 15 ml of concentrated hydrochloric acid.
SERVICE LABORATORY WORK INSTRUCTIONS
09/26/95 09/26/95
B.F. QLWI 4.10.54
2 of 2 B. FARKAS
DETERMINATION OF TRIVALENT CHROMIUM
Procedure (continued):
8)
Add 5 ml of 20% potassium iodide solution.
9)
Titrate with 0.10 N sodium thiosulfate standard solution to a straw colour, add 5 ml of starch indicator and continue titration until the blue colour disappears.
Calculation:
To calculate trivalent chromium, the “Determination of Chromic Acid” work instruction - QLWI 4.10.53 must have already been performed. Trivalent Chromium (g/l) = ( titration for trivalent chromium - titration for chromic acid ) x 9.0
SERVICE LABORATORY WORK INSTRUCTIONS
09/26/95 09/26/95
B.F. QLWI 4.10.55
1 B. FARKAS
DETERMINATION OF SULFATE BY KOCOUR TEST
Purpose:
To describe the steps to be taken to determine the concentration of sulfate in chromium plating solutions.
Procedure: Note: CR-110 and CR-710 solutions need to be heated to operating temperature prior to analysis.
1)
Filter sample through No. 1 filter paper, if necessary.
2)
Add 5 ml of kocour solution “A” to a centrifuge tube.
3)
Pipette 10 ml of sample into the centrifuge tube.
4)
Add 5 ml of kocour solution “B” to the centrifuge tube and stopper.
5)
Shake the tube for exactly one minute, then allow to stand for five minutes in the centrifuge.
6)
Centrifuge the tube for 5 minutes at 1250 rpm ± 50.
7)
Remove the tube and tap the stem until the precipitate has a flat surface, read.
Calculations: Sulfate ( g/l ) = ( Volume of precipitate ) x 1.5 (if Kocour tubes have no decimal, that is, the major graduations are 1,2,3,4,5,6)Sulfate ( g/l ) = ( Volume of precipitate ) x 15 (if Kocour tubes have a decimal, that is, the major graduations are 0.1,0.2,0.3,0.4,0.5,0.6)
SERVICE LABORATORY WORK INSTRUCTIONS
10/05/95 10/05/95
B.F. QLWI 4.10.59
1 B. FARKAS
METALLIC IMPURITIES BY ATOMIC ABSORPTION
Purpose:
To describe the steps to be taken to determine the concentration of metallic impurities in chromium plating solutions.
Reagents:
Distilled Water
Procedure:
1)
Pipette a 2 ml sample to a 100 ml volumetric flask. Dilute to the mark with distilled water and mix.
2)
Pipette 5 ml of this dilution to a 100 ml volumetric flask. Dilute to the mark with distilled water and mix. This represents a 1000X dilution.
3)
Obtain readings for required impurities using Atomic Absorption Spectroscopy.
Calculation:
ppm reading from A.A. = g/l in Chromium plating solution
