[Objective] It was based on the test paper as the carrier,to establish a fast determination method of harmful heavy metal cadmium in food.[Method]Taking potato as the sample,adding ascorbic acid and potassium iodide into the processed sample,adjusting the pH with sulfuric acid,the mixed sample was reacted with the prepared cadmium paper,and compared with the standard colorimetric plate.[Result]The 0.002% Vitoria blue B prepared with 0.3% ethanol solution was used as a chromogenic agent solution and was immersed in the formulated chromogenic agent solution using rapid quantitative filter paper,After soaking for 80-90 min at constant temperature at 40-45 ℃,the paper was dried and made into a cadmium test paper.The samples were treated by dry ashing,and a small amount of 0.06 mol/L ascorbic acid solution and 1.20 mol/L potassium iodide solution were added into the digested sample and mixed.Concentrated sulfuric acid solution of 2.0 mL was used to adjust pH.The experimental results measured the content of cadmium in potato was about 0.041 6 mg/kg.[Conclusion]The method was sensitive,rapid and convenient,and could be used for the rapid detection of cadmium in food.%[目的]以试纸作为载体,建立了食品中有害重金属镉的快速检测方法.[方法]以马铃薯为样品,在试样中加入抗坏血酸和碘化钾,用硫酸调节pH,取混合试样与制作好的镉试纸片反应后,与标准比色板比较.[结果]以0.3%乙醇溶液配制的0.002%维多利亚蓝B作为显色剂溶液,使用快速定量滤纸浸泡在配制好的显色剂溶液中,在40~45 ℃恒温浸泡80~90 min后避光晾干制作成镉试纸.用干灰化法处理样品,在消化处理后的试样中加入少量0.06 mol/L抗坏血酸溶液和1.20 mol/L碘化钾溶液并混匀,使用浓硫酸2.0 mL调节试液的pH,最后测出的马铃薯中有害重金属镉的含量约为0.041 6 mg/kg.[结论]该研究建立的方法具有检测灵敏、快速方便等特点,可用于食品中镉含量的快速检测.
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