Malik Ashok Kumar, Sharma Vanita, Sharma Vaneet Kumar, Rao A L J
Department of Chemistry, Punjabi University, Patiala, Punjab, India.
J Agric Food Chem. 2004 Dec 29;52(26):7763-7. doi: 10.1021/jf040326h.
A procedure has been developed for the determination of zinc(II) bis(dimethyldithiocarbamate) (ziram) and zinc(II) ethylenebis(dithiocarbamate) (zineb) after preconcentration on a column using naphthalene-(1,2'-pyridylazo)-2-naphthol (PAN) as adsorbent. Ziram and zineb are quantitatively retained on the column in the pH range of 9.0-12.5 and at a flow rate of 1-2 mL/min. The solid mass consisting of the Zn-PAN complex along with naphthalene is dissolved from the column with 5 mL of dimethylformamide (DMF). Absorbance of the complex was measured at 550 nm; Beer's law is obeyed over the concentration ranges of 2.0-22.0 microg of ziram and 5.0-19.8 microg of zineb in 10 mL of the final DMF solution. Ten replicate determinations on a sample solution containing 20 microg of ziram and 18 microg of zineb gave a mean absorbance of 0.33 with relative standard deviations of 0.80 and 0.70%, respectively. The interference of various ions has been studied. The method has been employed for the determination of ziram and zineb in commercial samples and in various foodstuffs, and the results were compared with the earlier reported methods.
已开发出一种程序，用于在使用萘 - (1,2'-吡啶偶氮)-2-萘酚（PAN）作为吸附剂在柱上预富集后测定双（二甲基二硫代氨基甲酸）锌（II）（福美锌）和乙撑双（二硫代氨基甲酸）锌（II）（代森锌）。福美锌和代森锌在pH值9.0 - 12.5范围内且流速为1 - 2 mL/min时定量保留在柱上。由锌 - PAN络合物与萘组成的固体物质用5 mL二甲基甲酰胺（DMF）从柱上溶解下来。在550 nm处测量络合物的吸光度；在最终10 mL DMF溶液中，福美锌浓度范围为2.0 - 22.0 μg以及代森锌浓度范围为5.0 - 19.8 μg时符合比尔定律。对含有20 μg福美锌和18 μg代森锌的样品溶液进行十次重复测定，平均吸光度为0.33，相对标准偏差分别为0.80%和0.70%。研究了各种离子的干扰。该方法已用于测定商业样品和各种食品中的福美锌和代森锌，并将结果与早期报道的方法进行了比较。
