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AXIAL-VIEW ICP-AES DETERMINATION OF Pb Cu As Cd Cr AND Co IN TEA

Shi YuanZhi, Lifeng Ma

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Abstract

Optimum conditions of simultaneous determination of Pb Cu As Cd Cr and Co in tea by ICP-AES were studied. Working parameters of the instrument were described in detail. It was shown that the results obtained by digestion of samples with micro-wave heating were better in accuracy and precision than by the dry-ashing method. The suitable acidity of the sample solution was found to be in the range 0.22mol·L~(-1) to 1.76mol·L~(-1) of HNO_3. RSD's (n=5) obtained were in the range 0.1%～8.3%, and recoveries were in the range 90%～104%, for all these elements. The proposed method has been used in the analysis of CRM (GBW07605—GSV—4) giving results consistent with the certified values.

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What this paper is about

Optimum conditions of simultaneous determination of Pb Cu As Cd Cr and Co in tea by ICP-AES were studied. Working parameters of the instrument were described in detail. It was shown that the results obtained by digestion of samples with micro-wave heating were better in accuracy and precision than by the dry-ashing method. The suitable acidity of the sample solution was found to be in the range 0.22mol·L~(-1) to 1.76mol·L~(-1) of HNO_3. RSD's (n=5) obtained were in the range 0.1%～8.3%, and recoveries were in the range 90%～104%, for all these elements. The proposed method has been used in the analysis of CRM (GBW07605—GSV—4) giving results consistent with the certified values.

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Available abstract

Optimum conditions of simultaneous determination of Pb Cu As Cd Cr and Co in tea by ICP-AES were studied. Working parameters of the instrument were described in detail. It was shown that the results obtained by digestion of samples with micro-wave heating were better in accuracy and precision than by the dry-ashing method. The suitable acidity of the sample solution was found to be in the range 0.22mol·L~(-1) to 1.76mol·L~(-1) of HNO_3. RSD's (n=5) obtained were in the range 0.1%～8.3%, and recoveries were in the range 90%～104%, for all these elements. The proposed method has been used in the analysis of CRM (GBW07605—GSV—4) giving results consistent with the certified values.

Key concepts: Ashing, Inductively coupled plasma atomic emission spectroscopy, Analytical Chemistry (journal), Chemistry, Certified reference materials, Inductively coupled plasma, Chromatography, Materials science

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