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用pH=11的0.1mol/L EDTA溶液在常温条件下1次提取普通过磷酸钙中有效磷,用钼黄比色法测定提取液中的磷,测定结果经校正后得到现场速测值。与标准值对照,回收率90%~110%,标准差0.192~0.780。方法操作简单,耗时不超过35 m in,适用于现场样品快速检测。
Phosphorus was extracted from ordinary superphosphate by 0.1 mol / L EDTA solution with pH = 11 at room temperature. Phosphorus content was determined by molybdenum yellow colorimetry. The measured values were measured and corrected on site. Compared with the standard value, the recovery rate of 90% to 110%, standard deviation of 0.192 ~ 0.780. The method is easy to operate and requires no more than 35 m in. It is suitable for rapid sample testing in the field.