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HG-AFS Determination of Total Selenium in Soil with Ultrasonically Assisted Sample Digestion

Wanfeng Zhang

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Abstract

As a modification for the standard method(NY/T 1104-2006),ultrasonic treatment for 20 min was adopted in the HNO3-HClO4 acid digestion of soil samples.Total selenium was determined by HG-AFS as described.Linearity range found was within 20 μg·L-1.Detection limit(3s/k) was found to be 0.01 μg·L-1.Result of average total selenium(0.13 μg·g-1) determined in a CRM(GBW 07419) was in consistency with the certified value(0.14±0.04 μg·g-1).Tests for recovery and precision were made by standard addition method at 3 different concentration levels,values of recovery and RSD′s(n=11) found were in the ranges of 90%-112% and 1.8%-3.7% respectively.

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What this paper is about

As a modification for the standard method(NY/T 1104-2006),ultrasonic treatment for 20 min was adopted in the HNO3-HClO4 acid digestion of soil samples.Total selenium was determined by HG-AFS as described.Linearity range found was within 20 μg·L-1.Detection limit(3s/k) was found to be 0.01 μg·L-1.Result of average total selenium(0.13 μg·g-1) determined in a CRM(GBW 07419) was in consistency with the certified value(0.14±0.04 μg·g-1).Tests for recovery and precision were made by standard addition method at 3 different concentration levels,values of recovery and RSD′s(n=11) found were in the ranges of 90%-112% and 1.8%-3.7% respectively.

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Available abstract

As a modification for the standard method(NY/T 1104-2006),ultrasonic treatment for 20 min was adopted in the HNO3-HClO4 acid digestion of soil samples.Total selenium was determined by HG-AFS as described.Linearity range found was within 20 μg·L-1.Detection limit(3s/k) was found to be 0.01 μg·L-1.Result of average total selenium(0.13 μg·g-1) determined in a CRM(GBW 07419) was in consistency with the certified value(0.14±0.04 μg·g-1).Tests for recovery and precision were made by standard addition method at 3 different concentration levels,values of recovery and RSD′s(n=11) found were in the ranges of 90%-112% and 1.8%-3.7% respectively.

Key concepts: Selenium, Chemistry, Digestion (alchemy), Detection limit, Certified reference materials, Chromatography, Analytical Chemistry (journal), Organic chemistry

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