作　　者： ; ; ;

机构地区： 汕头大学医学院

出　　处： 《光谱学与光谱分析》 2005年第4期576-578,共3页

摘　　要： 在pH 5～7 5的柠檬酸磷酸氢二钠缓冲体系中,水样中的痕量钴与加入的络合剂1 (2 吡啶偶氮)2 荼酚形成稳定的配合物。通过水浴6 6℃加热2h ,钴配合物被萃取到TritonX -10 0表面活性剂相并与水相分开。分离后的表面活性剂相用0 .5 %硝酸和0 .1%硝酸钯作基体改进剂,提高灰化温度,消除有机物的干扰,用氘(D)灯校正就可用石墨炉原子吸收法测定痕量钴。该方法萃取富集倍数可达10 0。样品检测下限(10σ)为0. 0 0 3μg·L-1。回收率为90 .5 %～10 6 %。用于矿泉水、河水、海水、饮用水中ng·L-1级的测定,结果令人满意。 In buffer solution of citric acid monohydrate-disodium hydrogen phosphate at pH 5-7.5, cobalt water samples were chelated by 1-(2-pyridylazo)-2-naphthol(PAN) to form CO-PAN. After water-bath at 66 ° C for two hours, Co-PAN is extracted into Triton X-100 nonionic surfactant phase and separated from bulk water. Extracted cobalt content was measured by graphite furnace atomic absorption spectrometry. The surfactant phase separated was treated with 0.5% HNO3-0.1% Pd(NO3)(2) to remove background interference at 1200 ° C temperature. The pre-concentration of cobalt in water samples permitted the detection of 0.003 μ g(.)L(-1) (10σ) with the enhancement factor of 100. The recoveries were 90.5%-106%. The proposed method was applied to the determination of cobalt in water samples and satisfactory results were obtained.

关 键 词： 石墨炉原子吸收法 痕量钴 测定 浊点萃取 水样 表面活性剂 磷酸氢二钠 基体改进剂 缓冲体系 吡啶偶氮 钴配合物 灰化温度 富集倍数 检测下限 柠檬酸 络合剂 硝酸钯 有机物 回收率 矿泉水 饮用水 分开 水相

领　　域： [理学] [理学] [环境科学与工程]