紫外分光光度法测定蔬菜硝态氮的改进
IMPROVEMENT OF DETERMINATION OF NITRATE NITROGEN IN VEGETABLE WITH UV-SPECTROPHOTOMETRY
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摘要: 将蔬菜样品制成浆液后,用Na2CO4-NaHCO3缓冲溶液及活性炭处理,再次处理液用H2SO4酸化,用双波长紫外分光光度法测定NO^-3-N。按指定试验条件,样品加标回收率为95.6%-103.0%,与镉柱法比较无显著差异。
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Keywords:
- vegetable /
- UV-spectrophotometry /
- nitrate nitrogen
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