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Posts Tagged ‘copper’

Deionized vs. Distilled Water

Monday, July 12th, 2010

By Gregory Salata, Ph.D., Kelso, WA

Deionized vs. Distilled Water

Many sampling programs include collection and analysis of an equipment blank to ensure there is no contribution of contaminants from the sampling equipment and associated process. To establish that sample collection procedures are contaminant free, an equipment blank is often collected. Equipment blanks are collected by passing water through the sample collection apparatus or utensil and collecting the water into the appropriate containers. To ensure that the water itself is contaminant free, the laboratory will supply the field crew with deionized (DI) water.

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Sequential Extraction Procedure

Tuesday, June 1st, 2010

By Pradeep Divvela, Project Chemist, Kelso, WA

ShakerSequential extraction is an analytical process that chemically leaches metals out of soil, sediment and sludge samples. The purpose of sequential “selective” extraction is to mimic the release of the selective metals into solution under various environmental conditions.

One commonly used sequential extraction procedure is designed to partition different trace metals based on their chemical nature.

The sequential extraction process is typically accomplished in four (4) steps using:

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How to Determine Metals Emissions by EPA Method 29

Monday, April 26th, 2010

By Ed Wallace, Project Chemist, Kelso, WAEPA Method 29

EPA Method 29 measures hazardous air pollutant (HAP) emissions from stationary sources for mercury and other metals. The Clean Air Act (CAA) requires all major sources to meet HAP emission standards reflecting the application of maximum achievable control technology (MACT). These sources include industrial, commercial, and institutional boilers and process heaters. The other metals to be tested are antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, manganese, nickel, phosphorus, selenium, thallium and zinc.

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