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近年来,用强碱性阴离子交换树脂制备螯合型树脂柱已愈益为人们所重视。但均存在柱流速慢(<5mL/min)、洗脱剂用量大、预处理时间长及富集系数小等缺点。曾有人用十八烷基键合玻璃微珠预浓缩并用PADAP分光光度法测定钴。特点是洗脱剂用量少、浓缩倍数高(500倍),但水样需经预处理。我们综合上述两类层析柱优点,将铜试剂(二乙胺二硫代甲酸钠,NaDDTC)中的螯合集团交换在强碱性阴离子树脂上,制备了螯合型树脂柱。初步实验证明,含铜水样流经DDTC阴离子交换树脂柱后形成的中性铜螯合物被键合在树脂上,用氯仿洗脱,可浓缩万倍,水样毋需预处理,检出下限10~(-11)g/mL。
In recent years, the use of strong base anion exchange resin chelate resin column has become more and more attention. However, there are shortcomings of slow column flow (<5mL / min), large amount of eluent, long pretreatment time and small enrichment coefficient. It has been pre-concentrated with octadecyl-bonded glass beads and PADAP spectrophotometric determination of cobalt. Characteristics are less eluent dosage, high concentration multiple (500 times), but the water samples need to be pre-treated. Based on the merits of the above two types of columns, we exchanged the chelating groups in the copper reagent (sodium diethyldithiocarboxylate, NaDDTC) on the strongly basic anion resin to prepare the chelating resin column. Preliminary experiments show that the copper-containing water samples through the DDTC anion exchange resin column formed after the neutral copper chelate is bonded to the resin, with chloroform elution, can be million times concentrated, water samples without pretreatment, detected Lower limit of 10 ~ (-11) g / mL.