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A rapid on-site analysis method for the simultaneous extraction and determination of Pb2+ and Cd2+ in cereals

机译：谷物中同时提取和测定PB2 +和CD2 +的快速现场分析方法

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In order to achieve rapid on-site screening and solve the problem of rapid pretreatment for the determination of lead (Pb2+) and cadmium (Cd2+) in cereals by a portable electrochemical analyzer with disposable screen-printed electrodes (SPEs), a new reliable and simple extraction method for Pb2+ and Cd2+ in cereals was developed. The Pb2+ and Cd2+ in cereals were purified by a mixed solution of 1 mol L-1 potassium iodide (KI)/5% vitamin C (VC)/ethyl acetate after being extracted by 10% HNO3, which transfers the Pb2+ and Cd2+ into ethyl acetate after a reaction with KI-VC. Then, the Pb2+ and Cd2+ were eluted from ethyl acetate with 5% HNO3 and were determined by an electrochemical analyzer with screen printed electrodes. Under the optimized conditions, the matrix calibration curves of Pb2+ and Cd2+ in rice and wheat showed good linear relationships with R-2 > 0.996. The method shows a detection limit (LOD) for Cd2+ in rice and wheat of 6.7 mu g kg(-1) and 11.5 mu g kg(-1), and the corresponding values for Pb2+ were 34.9 and 31.1 mu g kg(-1), respectively. The relative standard deviation (RSD) was less than 8.7% for Cd2+ and Pb2+. In addition, the recoveries of the tested reference materials using this method were between 80% and 120%. From sample pretreatment to testing results, the whole process took no more than 25 min, and the operation was simple for operators, green to the environment, cheap in terms of instruments, and above all suitable for on-site detection. The results implied that this portable electrochemical method with new pretreatment may be a good choice for screening Pb2+ and Cd2+ in cereal samples on-site.
机译：为了由便携式电化学分析仪与一次性丝网印刷电极（SPE）的，以实现快速现场筛选和解决快速预处理的铅在谷物的判定（PB2 +）和镉（CD2 +）的问题，一个新的可靠和对铅，镉+谷类简单的提取方法被开发。在谷物的Pb2 +和Cd2 +通过1个摩尔L-1碘化钾的混合溶液（KI）/ 5％的维生素C（VC）纯化/乙酸乙酯由10％HNO 3，其中Pb2 +和Cd2 +传输到乙基提取之后用KI-VC的反应后乙酸酯。然后，Pb2 +和Cd2 +，从用5％HNO 3的乙酸乙酯洗脱并通过电化学分析仪用丝网印刷电极来确定。在优化条件下，在水稻和小麦的Pb2 +和Cd2 +的矩阵校准曲线显示出与R-2> 0.996良好的线性关系。在水稻和6.7亩克千克（-1）和11.5亩克千克（-1），以及用于对Pb2 +相应值小麦的方法，示出了检测限（LOD）对于镉为34.9和31.1亩克公斤（-1 ）， 分别。的相对标准偏差（RSD）是为Cd2 +和Pb2 +的小于8.7％。此外，使用这种方法所测试的参考材料的回收率为80％和120％之间。从样品前处理到测试结果，整个过程花了不到25分钟，操作简单针对运营商，绿色的环境，便宜的在仪器方面，首先适用于现场检测。结果暗示，与新的预处理这种便携式电化学方法可用于现场筛选Pb2 +和Cd2 +麦片样品中一个不错的选择。

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    《RSC Advances》 |2019年第56期|共9页
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