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QENERAL ELECTRIC OOMPAHI* 6CHEHECTADX, 1.1,
T1^1.^...eeTSRMI*ATI01 OF COLOR BX THE A. P. 1. METHOD
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Applies to the determination of oolor of water white liquids,
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^Dissolve 1*245 grans/^fpetasstipe^ehlorplatinate (KjPtd*) contain* Ing 0*8 gran platinum* ane^X grim50jBry*talllzed eobaltous chloride
(COC1..0H.O) containing
Qhalt In water with 100 cc. of
concentrated HCl* DilutOobSlie. Xlt^fVwlth distilled water* This sol*
utloahas a oolor of BOO '
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*10 prepare standard sN&fcwlni a color of 5. 10* 15* BO* 25, 30* 35*
--* --* dilute 0*5,1* 1*5 et^fte*V>r the above solution to 50 nl
la 50 ^1* tall form Hessler tuWfcr^rrotect the tubes from avkporation
whan not in pse*
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The unit of oolor la that color produced by 1 mg* platlnam per litre,
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PROCECTJflEt
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*The color of the sample shall be observed by filling a matched
Me taler tube to a height equal to that In the standard tubes with the
liquid to be examined and comparing it with the standards* The determin
ation shall be made by looking vertically downward through the tubes up
on a white or mirrored surface placed at suqh an angle that light is re
flected through the column of the liquid** ^
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? This method is good only up to a color* intensity of about 100 A.P,H*
For reading higher values, the sample should be diluted with 1478 Pyranol
(maximum A*?&* color vj* and the eolor obtained by multiplying by the
dilution ratio*
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^ ,; C<>lors between 1 and 100 are recorded to the nearest * R^,^dora between 101fgnd 00 arerecordedJ|o tfce nearest 10* f __
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" Standard Methods far the Examination of Tatar and Sewage* sixth
Edition* 1925* Page 8* Publl&ed by the A.P*H*A. Method developed by
A* HaMen*
dwe/mp ~ DATE 10/29/40 Prepared by.
Copied 3-26-41 by RR
D*W* Calrd
PITTSFIELD WORKS Engineering Dept. Sketch Ho* H-6871825
DSW 330661
STLCOPCB4077305
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