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碳酸氢钠浸提-钼锑抗分光光度法测定土壤中的有效磷
引用本文:沈志群,张琪,刘琳娟,邱燕.碳酸氢钠浸提-钼锑抗分光光度法测定土壤中的有效磷[J].环境监控与预警,2011,3(5):12-15.
作者姓名:沈志群  张琪  刘琳娟  邱燕
作者单位:南通市环境监测中心站,江苏 南通 226006
基金项目:2008年度环境保护标准制修订项目(1013)
摘    要:用0.50 mol/L碳酸氢钠溶液浸提中性和石灰性土壤中的有效磷.碳酸氢钠可以抑制溶液中Ca2+的活度,使某些活性较大的磷酸钙盐被浸提出来,同时也可使活性磷酸铁、铝盐水解而被浸出.浸提液与钼锑抗显色剂反应生成磷钼蓝,在波长880 nm处测量吸光度.当取样量为2.50 g时,使用50 mL碳酸氢钠溶液浸提,使用1 cm比...

关 键 词:土壤  有效磷  碳酸氢钠浸提  分光光度法
收稿时间:6/9/2011 12:00:00 AM
修稿时间:2011/7/13 0:00:00

Determination of Available Phosphorus in Soil by Sodium Bicarbonate Extraction Mo-Sb Anti-spectrophotometry Method
SHEN Zhi-qun,ZHANG Qi,LIU Lin-juan,QIU Yan.Determination of Available Phosphorus in Soil by Sodium Bicarbonate Extraction Mo-Sb Anti-spectrophotometry Method[J].Environmental Monitoring and Forewarning,2011,3(5):12-15.
Authors:SHEN Zhi-qun  ZHANG Qi  LIU Lin-juan  QIU Yan
Institution:SHEN Zhi-qun,ZHANG Qi,LIU Lin-juan,QIU Yan(Nantong Environmental Monitoring Central Station,Nantong,Jiangsu 226006,China)
Abstract:The available phosphorus was extracted by 0.50 mol/L sodium bicarbonate solutionin neutral and calcareous soil. Sodium bicarbonate solution can inhibit the activity of Ca2 +, so that the calcium phosphate of large activity were extracted; meanwhile active iron phosphate and aluminum salt was leached by hydrolysis. Molybdenum Blue reaction occurred by mixing elution and Mo-Sb anti-chromogenic reagent and the absorbance was measured at a wavelength of 880nm. In this study, the method of measuring concentrations of available phosphorus in soil was developed. The sample volume was 2.50 g and sodium bicarbonate solution was 50 ml. The detection limit of this method was 0.4 mg/kg and lower limit was 1.6 mg / kg when 1 cm cuvette was used.
Keywords:soil  available phosphorus  sodium bicarbonate extraction  spectrophotometry
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