吉林省部分市售小麦粉中20种金属元素的含量分析

Content of 20 kinds of element in wheat flour from part of Jilin province

目的研究吉林省部分市售小麦粉中Fe、Ag、Al、As、Ba、Be、Cd、Co、Cr、Cu、Mn、Mo、Ni、Pb、Sb、Se、Tl、V、Zn、U等20种金属元素的含量情况,有助于摸清小麦粉中各元素的本底及污染情况,为吉林省食品安全监管提供科学依据。方法收集吉林省9市州样本共计72份,用微波消解前处理-电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)测定样品中各元素含量。结果检测72份小麦粉中20种金属元素,除Be、Ag、Sb、TI、U 5种元素未检出外,其余各元素的检出平均值依次为Fe(11.1mg/kg)、Zn(5.77 mg/kg)、Mn(5.12 mg/kg)、Al(3.33 mg/kg)、Cu(1.36 mg/kg)、Ba(0.59 mg/kg)、Mo(0.23 mg/kg)、Co(0.16 mg/kg)、Cr(0.10 mg/kg)、Ni(0.080 mg/kg)、Se(0.075 mg/kg)、Pb(0.027 mg/kg)、V(0.025 mg/kg)、As(0.021 mg/kg)、Cd(0.013 mg/kg)。Cr、As、Cd、Pb含量合格率100%。结论小麦粉中金属元素未发现有超标现象,可以正常食用,对于元素铅的普遍检出问题及个别样品中铅检出值较高问题应引起重视。

Objective To investigate the content of 20 kinds of element including iron, silver, aluminum, arsenic, barium, beryllium, cadmium, cobalt, chromium, copper, manganese, molybdenum, nickel, lead, antimony, selenium, thallium, vanadium, zinc, uranium in wheat flour sold in Jilin province, so as to understand the background and pollution of each element in wheat flour, which will provide a scientific basis for food safety regulation of Jilin province. Methods A total of 72 kinds wheat flour samples were collected from 9 city of Jilin province. The content of each element was determined by inductively coupled plasma mass spectrometry with microwave digestion. Results In the 72 kinds of wheat flour, beryllium, silver, antimony, thallium and uranium was not detected. The average value of each element in wheat flour as follow： iron 11.1 mg/kg, zinc 5.77 mg/kg, manganese 5.12 mg/kg, aluminum 3.33 mg/kg, copper 1.36 mg/kg, barium 0.59 mg/kg, molybdenum 0.23 mg/kg, cobalt 0.16 mg/kg, chromium 0.10 mg/kg, nickel 0.080 mg/kg, selenium 0.075 mg/kg, lead 0.027 mg/kg, vanadium 0.025 mg/kg, arsenic 0.021 mg/kg, and cadmium 0.013 mg/kg, respectively. The qualified rate of Cr, As, Cd, Pb was 100%. Conclusion Overproof of metal elements has not been detected, so wheat flour can be eaten normally. It should be paid more attention to the problem of the general detection of Pb and the higher detection value of Pb in individual samples.