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(05):12-15
.Determination of Available Phosphorus in Soil by Sodium Bicarbonate Extraction Mo –Sb Anti-spectrophotometry Method[J].Environmental Monitoring and Forewarning,2011,3(05):12-15
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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
沈志群,张琪,刘琳娟,邱燕
南通市环境监测中心站,江苏 南通 226006
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,使用50 ml碳酸氢钠溶液浸提,使用1cm比色皿时,检出限为0.4 mg/kg,测定下限为1.6 mg/kg,满足了土壤有效磷的监测要求。
关键词:  土壤  有效磷  碳酸氢钠浸提  分光光度法
DOI:
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基金项目:2008年度环境保护标准制修订项目(1013)
Determination of Available Phosphorus in Soil by Sodium Bicarbonate Extraction Mo –Sb Anti-spectrophotometry Method
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.
Key words:  soil  available phosphorus  sodium bicarbonate extraction  spectrophotometry