Determination of ultratrace cadmium in food and environmental samples by ETAAS after vapor generation and <italic>in situ</italic> preconcentration

doi:10.1007/s11703-009-0051-9

Front Agric Chin

2009, Vol. 3

Issue (3) : 294-299 https://doi.org/10.1007/s11703-009-0051-9

RESEARCH ARTICLE

Determination of ultratrace cadmium in food and environmental samples by ETAAS after vapor generation and in situ preconcentration

Ran SUO^1,2,3(

), Weijuan AN¹, Na LI¹

1. College of Food Science, Agricultural University of Hebei, Baoding 071001, China; 2. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China; 3. Tianjin Rice Technical Engineering Center, Tianjin 300457, China

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Abstract

A method is described for the determination of ultratrace cadmium by coupling a continuous flow vapor generation system with in situ preconcentration technique and electrothermal atomic absorption spectrometry (ETAAS). A graphite tube coated with Ir as permanent chemical modifier was used for trapping cadmium vapor species. The effects of the flow rates of carrier gas and sample injection in vapor generation systems on the trapping measurement for cadmium were respectively investigated. Graphite tubes with different characteristic surfaces were comparatively studied for trapping cadmium vapor. The experimental results showed that the permanent chemical modifier of Ir is an alternative to the thermolabile modifier of Pd for simplifying the trapping measurement. The trapping efficiency of cadmium on the graphite tube coated with Ir was estimated. The trapping temperature and time were also investigated. A detection limit (3σ) of 0.005 μg·L^-1 was obtained for this proposed method. The relative standard deviation (RSD) was 1.4% for 0.5 μg·L^-1 of Cd (n=11). This method can be applied to the determination of ultratrace cadmium in food and environmental samples with good agreement between the certified and found values.

Keywords vapor generation ETAAS permanent chemical modifier in situ preconcentration cadmium

Corresponding Author(s): SUO Ran,Email:ransuo@yahoo.com.cn

Issue Date: 05 September 2009

Cite this article:

Ran SUO,Weijuan AN,Na LI. Determination of ultratrace cadmium in food and environmental samples by ETAAS after vapor generation and in situ preconcentration[J]. Front Agric Chin, 2009, 3(3): 294-299.

URL:

https://academic.hep.com.cn/fag/EN/10.1007/s11703-009-0051-9
https://academic.hep.com.cn/fag/EN/Y2009/V3/I3/294

Fig.1 Schematic diagram of the vapor generation and trapping system
Note: Numbers of (1)-(9) represent peristaltic pump, KBH, sample, waste, carrier gas, mixing tube, gas/liquid separator (GLS), transfer line and graphite tube, respectively.

Tab.1 Temperature program for graphite tube coating

Tab.2 Temperature program for trapping and measurement

Fig.2 Effects of trapping temperature on the signal
Note: (a) Zr-coated, (b) Ir-coated, (c) Pd-coated and (d) uncoated.

Fig.3 Effects of atomization temperature on the signal
Note: (a) Ir-coated; (b) uncoated.

Tab.3 Analytical results (average ±, =7)

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