EPA Method 330.5
ALS - Columbia offers EPA Method 330.5 testing at these laboratories:
|Jacksonville, Florida Laboratory|
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View Actual EPA Method 330.5 (PDF File)
EPA Method 330.5:
Total Residual Chlorine by Spectrophotometer. Official Name: Chlorine, Total Residual (Spectrophotometric, DPD)
Chlorine (hypochlorite ion, hypochlorous acid) and chloramines stoichiometrically liberate iodine from potassium iodide at pH 4 or less. The liberated iodine reacts with N,N-diethyl-p-phenylene diamine (DPD) to produce a red colored solution. The solution is spectrophotometrically compared to a series of standards, using a graph or a regression analysis calculation.
The DPD-Colorimetric method is applicable to natural and treated waters at concentrations from 0.2-4 mg/L.
Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Any oxidizing agents; these are usually present at insignificant concentrations compared to the residual chlorine concentrations. Turbidity and color will essentially prevent the colorimetric analysis.
Maximum Holding Time:
Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.
Chlorine, Total Resi
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