离子色谱法测定土壤中草甘膦的提取溶液选择

以辽宁棕壤等10种土壤为样品,探讨了水和p H值=9.00~14.00的氢氧化钠(Na OH)作为提取液对草甘膦分析的影响。结果表明,以水为提取液,仅石灰性紫色土和灰钙土能获得较高的回收率,其他所测土壤尤其是p H值<8.00的土壤其回收率较低,提取效果受土壤理化性质影响明显。以p H值=9.00~14.00的Na OH为提取液,随着提取液p H值的提高,所测土壤的回收率均随之提高,达到一定的p H值后,回收率随之提高不明显,但干扰会增多。当已知土壤相关理化性质时,可以参考回收率相关性分析选择合适的提取液。

Selection of Extraction Solution for Determination of Glyphosate in Soil by Ion Chromatography

10 soil samples such as Liaoning brown soil were used to explore the influence of water and NaOH with pH range of 9.00-14.00 as extraction solutions on the analysis. The results showed that only calcareous purple soil and sierozem could obtain a higher extraction rate with water as the extraction solution. Other tested soils, especially soils with pH<8, showed lower extraction rates, indicating that the extraction effect of water is affected by the physical and chemical properties of the soil. When NaOH, with pH value in the range of 9.00-14.00, was used as the extraction solution, as the pH value increased, the extraction efficiency increased. Once pH reached a certain value, the extraction efficiency would not increase significantly, but the interference would increase.Therefore, when the physical and chemical properties of the soil are available, suitable extraction solution can be selected referring to the correlation analysis of the extraction rate.