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8 3 3 After 5 mmutes, measure the absorbance at 650 nm wIth a spectrophotometer and determme the phosphorus concentratlOn from the standard curve The color IS stable for at least one hour For concentratlOns m the range of0 01 to 03 mg PII, a 5 cm cell should be used A one cm ceil should be used for concentratlOns m the rangeof0 3to 12mgPI1 9 CalculatlOn 9 1 Prepare a standard curve by plottmg the absorbance values of standards versus the correspondmg phosphorus concentratlOns on lmear graph paper 9 2 Obtam concentratlOn value of sample dIrectly from prepared standard curve Report results as P, mgll 10 PreclslOn and Accuracy 101 PrecisiondataISnotaval1ableatthIStIme 102 In a smgle laboratory (EMSL) usmg mdustnal waste and sewage samples at concentratlOns of7 6 and 055 mg PII, recovenes were 99 and 100%, respectively 3653-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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