Sampling/Testing Analysis

Wastewater treatment plants and other facilities are faced with mercury effluent limits in their permits. Since it only takes a small amount of mercury to contaminate a water supply, mercury levels have been set very low (1.3 ng/L) in permits. Facilities must use ultra-clean techniques when collecting and analyzing samples in order to prevent contamination. Method 1631, the newest, most sensitive analytical technique, can read levels below one nanogram per liter, but contamination is very likely when trying to achieve results this low. Those handling the samples must take extra precaution with hygiene to assure reliable results.

For more detailed information on mercury analysis, including method 1631, visit:

• Low-Level Mercury
• Method 1631:Guidelines Establishing Test Procedures for the Analysis of Pollutants; Measurement of Mercury in Water [exit DNR]