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我们在探讨Ce组稀土和Y共存的条件下与偶氮氯膦-PN显色剂络合的导数光谱性质和测定,发现一阶导数可将重叠吸收带分开,因而提出导数光度法同时测定Ni基合金和钢中稀土与Y的可能性,经过试验,获得较好的结果。首先分别配制Ce组稀土(La:Ce.Pr.Nd=2:5:1:2)和Y各为10μg/mL的标准溶液。取不同量注入25mL量瓶中混合。依次加入3NHClO_41mL,2％VC1mL,0.05％偶氮氯膦-PN3mL,于20℃左右放置30min,用水稀释至刻度。用试剂空白作参比。用1cm比色皿在600—800nm范围进行导数测量,按峰-谷法测量峰高。 Ce组稀土和Y共存时,与偶氮氯膦-PN络合物的吸收光谱在675和730nm处相互重叠,
In order to investigate the properties and determination of the complexation of azoclophorone-PN reagent with the presence of rare earth and Y in the Ce group, we found that the first derivative can separate the overlapping absorption bands. Therefore, the simultaneous determination of Ni Base alloy and steel Rare earth and Y possibilities, after testing, get better results. First, Ce standard solution of rare earth (La: Ce.Pr.Nd = 2: 5: 1: 2) and Y each 10μg / mL were prepared. Take different amount into 25mL volumetric flask and mix. Followed by adding 3NHClO_41mL, 2% VC1mL, 0.05% chlorophosphonazo-PN 3mL, placed at about 20 ℃ 30min, diluted with water to the mark. Reagent blank for reference. 1cm cuvette in the 600-800nm range derivative measurement, peak-valley method to measure the peak height. When the rare earths of Ce group coexist with Y, the absorption spectra with the chlorophosphonazo-PN complex overlap with each other at 675 and 730 nm,