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建立了生活用纸中乙二醛残留量的分光光度测定方法。乙二醛以甲基红-亚甲基蓝为指示剂,用氢氧化钠溶液标定并绘制标准曲线。试样经水萃取,乙二醛与2-亚肼基-2,3-二氢-3-甲基苯并噻唑盐(HMBT)在乙酸溶液中80℃下反应生成一种黄色化合物,然后用分光光度法在405 nm波长下进行测定,甲醛无干扰。该方法线性相关性系数0.9999,摩尔吸收系数4.78×104L/(mol·cm),检出限0.20 mg/kg,6次平行测定的标准偏差为3.16%~5.59%,回收率84.75%~91.03%。该方法操作简便,实用性强,选择性、检出限、定量限、线性、灵敏度、精密度和回收率均满足相关技术法规对生活用纸中乙二醛残留量限量的规定。
A method of spectrophotometric determination of glyoxal residue in tissue paper was established. Glyoxal with methyl red - methylene blue as an indicator, with sodium hydroxide solution calibration and draw the standard curve. The sample was extracted with water and glyoxal reacted with 2-hydrazono-2,3-dihydro-3-methylbenzothiazolium salt (HMBT) in acetic acid at 80 ° C to form a yellow compound. Spectrophotometry at 405 nm wavelength determination, formaldehyde no interference. The linear correlation coefficient was 0.9999 and the molar absorption coefficient was 4.78 × 104 L / (mol · cm). The detection limit was 0.20 mg / kg. The standard deviation of 6 replicates was 3.16% -5.59% and the recovery was 84.75% -91.03% . The method is simple, practical, selective, limit of detection, limit of quantification, linearity, sensitivity, precision and recovery meet the relevant regulations on the regulation of the amount of glyoxal residues in tissue paper.