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).
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