Method 7470A

Mercury in Liquid Waste (Manual Cold-Vapor Technique)

This method is for the determination of total mercury (organic and inorganic) from aqueous wastes, and ground waters. The sample must be completely digested prior to analysis by cold-vapor atomic absorption (CVAA).

In this method mercury is reduced its elemental state and aerated from solution in a closed system.  Mercury vapor passes through a cell positioned in the light path the atomic absorption spectrophotometer.  Absorbance (peak height) is measured as a function of mercury concentration. The typical instrument detection limit (IDL) for this method is 0.0002 mg/L.

Note:  This method replaces Method 7470.

(EPA SW-846)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   28 days from sample collection to analysis.
Preservatives:   Acidify the sample with HNO3 to pH < 2.
Required Preps:   500mL Glass or HDPE container
Collection Method:   SW-846 Chapter 9, grab sampling
Analytical Methodology:   CVAA
Documentation:   7470A

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.