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10 PrecIsIon and Accuracy 10 1 USIng the extractIOn procedure for concentratIOn of color, SIX laboratorIes analyzed samples at concentratIOns of 9 6, 48 3, and 93 5 ug/l Standard devIatIOns were ±O 99, ±3 1and ±4 2 ug/l, respectIvely 102 USIng the dIrect photometrIc procedure, SIX laboratorIes analyzed samples at concentratIons of 47,482 and 97 0 mg/l Standard devIations were ±O 18, ±O 48 and ±1 58 mg/l, respectIvely Bibliography Annual Book ofASTM Standards, Part 31, "":ater", Standard DI783-70, p553 (1976) Standard Methods for the EXamInatIOn of Water and Wastewater, 14th EdItIOn, p574-581, Method 510 through 51Oe, (1975) 1 2. 4201-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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