接装纸中汞、砷、铅等8种元素的分析研究

本文利用电感耦合等离子体发射光谱仪(ICP-AES法)同时测定接装纸样品中铅、铜、镉、铬、锡、锑元素含量,汞、砷元素含量采用冷原子吸收光谱法和银盐法测定.结果表明接装纸样品中锡元素含量最高,铜次之,汞、砷、铅相比,砷元素含量较高,部分样品中砷、铅元素含量超出食品包装用纸的最高限量标准.采用ICP-AES法同时测定接装纸6种元素,操作简便,重复性好,回收率高.此外,本文还对接装纸荧光物质和脱色程度进行了测定分析,从随机抽检的47份国产、进口接装纸样品看,进口白色接装纸无荧光,国产白色接装纸有荧光,珠光色接装纸个别有荧光,纸边为白色的接装纸荧光程度不一.脱色试验表明,进口接装纸,国产印刷型接装纸、珠光纸不脱色,涂布型接装纸均有不同程度的脱色.

The determination of Hg, As, Pb, Cr, Cu, Sn, Sb and Cd in tipping paper

The trace elements Pb, Cr, Cu, Sn, Sb and Cd in tipping paper were determined simultaneously by method of ICP -AES, while Hg and As were determined by method of cold atomic absorbance spectrometry and silver salt, respectively. Results showed that the content of Sn was the highest, Cu the second, and As was higher than Hg and Pb in tipping paper. The content of As and Pb in part of the samples exceeded the highest limited standard of food packing paper. It was indicated that the method of simultaneous and direct determination of six elements by ICP -AES was simple and with high stability and recovery. In addition,the fluorescent characteristic and decolorization degree of the paper were analyzed. Among the 47 samples of tipping paper, imported tipping paper samples showed no fluorescence while domestic white ones were fluorescent. Some of the pearl lusting tipping samples were fluorescent, and papers with white edge showed fluorescence to various extent. The decolorization experiment showed that the imported paper, domestic print type paper and pearl lusting paper were not decolorized, while coated papers were decolorized to various degree.