金属(Ⅱ)-DDTC螯合物微粒的共振散射光谱研究及分析应用

Resonance Scattering Spectral Properties of Some Metal(Ⅱ)-Diethyldithiocarbameate Chelate Complex Particles and its Analytical Application

对Co（Ⅱ）-DDTC、Cu（Ⅱ）-DDTC、Cd（Ⅱ）-DDTC、Pd（Ⅱ）-DDTC、N i（Ⅱ）-DDTC、Pb（Ⅱ）-DDTC、Fe（Ⅱ）-DDTC 7种螯合微粒体系的吸收光谱和共振散射光谱进行了研究.解释了纳米微粒共振散射效应和体系的呈色.在选定条件下,金属离子的浓度与共振散射强度（IRS）呈较好的线性关系.用共振散射检测痕量钴时,其线性范围为0.012-1.44μg/mL,检出限为0.001 2μg/mL.用于针剂维生素B12中钴的测定,结果满意.

Under the condition of suitable pH ,sodium diethyldithiocarbameate（DDTC） reacts with some metal ions, such as Co （ Ⅱ ）, to form chelate nanoparticles, showing different colors and resonance scattering spectrum properties. The absorption and the resonance scattering spectrum of seven chelate particles systems [ Co （ Ⅱ ） - DDTC,Cu（ Ⅱ ）-DDTC,Cd（ Ⅱ ）-DDTC,Ni（ Ⅱ ）-DDTC,Pb（ Ⅱ ）-DDTC,Fe（ Ⅱ ）-DDTC,Pd（ Ⅱ ）-DDTC] are studied. In the specified metal ion concentration range, there is a good linear relationship between metal ion concentration and resonance scattering strength. When detecting microcobalt by resonance scattering, the linear range is 0. 012 - 1. 440 μg/mL and the detection limit is 0. 001 2 μg/mL. The method is applied to the determi- nation of cobalt inVB12 with satisfactory results.