| 偶氮氯膦Ⅰ光度法连续测定土壤水溶性钙和镁 |
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| 引用本文： | 丘星初,朱盈权.偶氮氯膦Ⅰ光度法连续测定土壤水溶性钙和镁[J].土壤学报,1982,19(4):396-402. |
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| 作者姓名： | 丘星初 朱盈权 |
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| 作者单位： | 江西省赣州地区农业科学研究所;一成都市82号信箱 |
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| 摘 要： | 偶氮氯膦Ⅰ(简称CPA Ⅰ)作为光度显色剂最初应用于测定铀和镤4,5],后又用于测定镉、铜、锆、钍、镧和钇3],近年则被应用于测定镁1,2].但应用于测定钙,尚未见国内外报道.本文研究了Ca-CPA Ⅰ络合物的形成条件、组成和稳定常数,应用于土壤水溶性钙镁的连续测定,获得了较满意的结果.
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UCCESSIVE SPECTROPHOTOMETRIC DETERMINATION OF WATER-SOLUBLE CALCIUM AND MAGNESIUM IN SOILS WITH CHLOROPHOSPHONAZO I |
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| Qiu Xing-chu and Zhu Ying-quan.UCCESSIVE SPECTROPHOTOMETRIC DETERMINATION OF WATER-SOLUBLE CALCIUM AND MAGNESIUM IN SOILS WITH CHLOROPHOSPHONAZO I[J].Acta Pedologica Sinica,1982,19(4):396-402. |
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| Authors: | Qiu Xing-chu and Zhu Ying-quan |
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| Institution: | Ganzhou Research Institute of Agricultural Science, Jangxi;P.O. Box 82, Chengdu |
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| Abstract: | This paper deals with the forming condition, composition, structure and apparent stability constant of complex formed by calcium and CPA I ( Chlorophosphonazo I ) and its application in soil analysis. Results showed that the complex was formed at pH 9-11.5 and remained stable for 5 hr. The maximum absorption wavelength of the complex was 570-575 um, where the apparent mole absorption coefficient was 1.42×104 and the apparent stability constant was 2.43×106. The ratio of Ca and CPA I in the complex was estimated to be 1:1. The calibration curve was linear in the range from 0 to 40pg/25m1. A sensitive method has been developed for rapid successive determination of calcium and magnesium in the presence of iron, aluminium, zinc, cobalt, etc.,
using TEA and 1, 10-phenathroline as masking agents. |
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