EPA Method 9250

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EPA Method 9250:
CHLORIDE (COLORIMETRIC, AUTOMATED FERRICYANIDE AAI)

Summary:
Thiocyanate ion (SCN) is liberated from mercuric thiocyanate through sequestration of mercury by chloride ion to form un-ionized mercuric chloride. In the presence of ferric ion, the liberated SCN forms highly colored ferric thiocyanate in a concentration proportional to the original chloride concentration.

Scope:
This automated method is applicable to ground water, drinking, surface, and saline waters, and domestic and industrial wastes. The applicable range is 1 to 250 mg Cl per liter of sample.

Report Number:
SW-846 Ch 5