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Posts Tagged ‘ICP/MS’

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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Cadmium Exposure and Testing

Monday, May 3rd, 2010

By Elisabeth Lutanie, Ph.D.Cadmium Exposure and Testing

Cadmium is a transitional metal that can have harmful cumulative effects on the human body. This article explains what cadmium is, where it comes from, how people get exposed to it, and how laboratories can test for it.

What is Cadmium?

Cadmium (Cd, atomic number 48) is a silver- or bluish-white metal in the group 12 of the periodic table. It is usually found with an oxidation state of +2 and combined with other elements such as oxygen (cadmium oxide), chlorine (cadmium chloride), or sulfur (cadmium sulfate, cadmium sulfide). It is also a cumulative poison associated with an array of syndromes such as renal dysfunction, reproductive toxicity, and bone defects. It is classified as a human carcinogen (Group 1) by the International Agency for Research on Cancer [1], and as a probable human carcinogen (Group B1) by the Environmental Protection Agency (EPA).  

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Ultra-Trace Arsenic Speciation at Columbia Analytical

Thursday, September 24th, 2009

Arsenic Speciation

Ultra-trace speciation of arsenic and other metals is performed using a variety of techniques tailored to the specific combination of species, matrix, and detection limits required. Currently, two analytical systems are applied: Ion Chromatography-Inductively Coupled Mass Spectrometry (IC-ICP-MS) and Hydride Generation-Cryogenic Gas Chromatography-Flame Atomic Absorption Spectrometry (HG-CGC-AAS). Each of these techniques has particular strengths that can be exploited depending upon the scientific question being asked. These techniques are combined with specific extraction techniques in order to maximize speciation integrity and data quality.

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