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偶氮氯膦-mC(简称CPA-mC)是在研究不对称变色酸双偶氮氯膦型显色剂的基础上合成的新显色剂,学名为2-(4-氯-2-膦酸基苯偶氮)-7-(3-氯苯偶氮)-1,8-二羟基萘-3,6-二磺酸.经试验,CPA-mC在强酸介质中能与钪形成紫色络合物,反应灵敏度较高(ε_(760)=4.5×10~41·mol~(-1)·cm~(-1);Sandell灵敏度为0·0010μg·cm~(-2)),试剂和络合物稳定.在有乳化剂OP存在下,络合物的选择性大大提高,该络合物中Sc:CPA-mC=1:3.当Sc_20_3浓度为9～30μg/25ml时,符合比尔定律.
Chlorophosphonazo-mC (abbreviated CPA-mC) is a new color reagent synthesized on the basis of the study of asymmetric chromotropic acid bis-chlorophosphonazo-type developer, named 2- (4-chloro-2- Phosphonophenylazo) -7- (3-chlorophenylazo) -1,8-dihydroxynaphthalene-3,6-disulfonic acid.According to the test, CPA-mC can form purple with scandium in strong acid medium The complex has high sensitivity (ε 760 = 4.5 × 10 -4 mol -1 cm -1) and Sandell sensitivity is 0.001 0010 μg · cm -2 And the stability of the complex in the presence of emulsifier OP, the selectivity of the complex greatly increased, the complex Sc: CPA-mC = 1: 3. When the concentration of Sc_20_3 9 ~ 30μg / 25ml, in line with Bill’s law.