超声浸提-电感耦合等离子体发射光谱法测定石灰性土壤中的有效磷

Determination of Avaiable Phosphorus in Calcareous Soil by Inductively Coupled Plasma Emission Spectrometry with Ultrasonic Extraction

  • 摘要: 采用超声浸提-电感耦合等离子体发射光谱法(ICP-AES)实现了石灰性土壤中有效磷的快速、准确、批量化分析要求. 将水土混合液在400 W超声功率下于25 ℃浸提10 min,用3.50 g苯乙烯阳离子交换树脂降低基体干扰. 分析谱线P 214.914 nm,射频功率1 150 W,载气流量0.6 L/min,采用ICP-AES测定有效磷. 结果显示:磷在0~5.00 mg/L范围内校准曲线线性良好(相关系数0.999 6),检出限为0.072 mg/kg. 方法用于4种不同碱性土壤有效态标准物质的分析,测定值相对误差小于±7%,相对标准偏差小于10%,且和标准方法(NY/T 1121.7—2014)测定值接近.

     

    Abstract: The inductively coupled plasma emission spectrometry (ICP-AES) with ultrasonic extraction method was used to achieve the fast, accurate and massive analysis of available phosphorus in calcareous soil. The mixture was extracted at 25 ℃ for 10 min at ultrasonic power of 400 W, and 3.50 g styrene cation exchange resin was used to reduce matrix interference. The available phosphorus was determined by ICP-AES at the analyzed spectral line of P 214.914 nm, radio frequency power of 1 150 W and carrier gas flow rate of 0.6 L/min. The results showed that the calibration curve was linear (correlation coefficient of 0.999 6) when the concentration of phosphorus was 0~5.00 mg/L, and the limit of detection was 0.072 mg/kg. The method was used to analyze the available state stardand materials in 4 different alkaline soils, the relative error were less than ±7%, the relative standard deviation were less than 10%, and it were close to the measured values of standard method (NY/T 1121.7—2014).

     

/

返回文章
返回