土壤中有效钼的极谱(催化波)测定方法
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POLAROGRAPHIC (CATALYTIC WAVE) DETERMINATION OF AVAILABLE MOLYBDENUM IN SOIL
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    摘要:

    土壤中钼的含量很低,根据现有资料,我国土壤中钼的平均含量是1.7ppm,有效态钼的含量更少,一般在0.1ppm以下.为了明确土壤的含钼量和合理施用钼肥来提高农作物产量,有必要测定土壤中有效态钼.过去习用的测定方法是硫氰酸钼比色法和极谱法[3],测定下限为1ppm,因此取样量大,分离手续烦琐,分析过程冗长,每周每人仅能分析10个左右标本.

    Abstract:

    A polarographic method for determination of molybdenum in soil was developed. In supporting electrolytic solution of sulphuric acid, sodium chlorate and amygdalic acid, a catalytic wave of molybdenum can be formed with a detection limit below 1 ppb. Since 1975, large amount of soil samples have been analyzed and it is proved satisfactory. For determination of available molybdenum in calcareous soils 5g of soil sample is extracted with 50 ml of ammonium oxalate and oxalic acid solution (pH 3.3),shake for 8 hours as conventional way. Transfer 10 ml of the extract into a small beaker (GG-17 glass) Evaporate to dryness. Ignite to destroy oxalate. Dissolve the residue with 2.5 ml of 2N sulphuric acid and 2.5 ml of 0.4M amygdalic acid, and then add 5.0 ml of 50% sodium chlorate, and mix evenly. Record the polarogtaphic wave from -0.1V. Removal of oxygen is unnecessary.

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徐俊祥,朱其清.土壤中有效钼的极谱(催化波)测定方法[J].土壤学报,1983,20(2):197-204. Xu Junxiang, Zhu Qiqing. POLAROGRAPHIC (CATALYTIC WAVE) DETERMINATION OF AVAILABLE MOLYBDENUM IN SOIL[J]. Acta Pedologica Sinica,1983,20(2):197-204.

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  • 在线发布日期: 2013-02-25
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