Rapid Determination of Lead and Cadmium in Pollute Vegetable by Rhodamine 6G Colorimetry
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Abstract:
Dry vegetable was extracted by nitric acid (1+11) and the content of lead and cadmium in sample could be simultaneously got by rhodamine 6G aqueous phase colorimetric test. The results confirmed that lead and cadmium had good linear relation in concentration range of 0.1~1.0 μg/mL and 0.01~0.1 μg/mL, respectively. The best pH value for the colorimetric system is 5.0. Compared with wet extraction, the average extraction efficiency of nitric acid for lead and cadmium were 97.47% and 96.82%, and average RSD was less than 5. Average recoveries of standard addition in six samples were 102.6% and 101.2%.
