聚磷酸铵肥料聚合度与聚合率测定方法比较

doi:10.6048/j.issn.1001-4330.2017.10.007

摘要/Abstract

摘要： 【目的】研究水溶性聚磷酸铵核心指标及相应测定方法，建立相关测定标准。【方法】采用端基滴定法与纸层析法对标准样品和肥料样品的聚合度测定结果进行对比分析;通过比较钼蓝比色法、钼黄比色法以及纸层析法三种方法对标准样品和肥料样品聚合率测定结果的准确性。【结果】端基滴定法与纸层析法标准曲线拟合性良好，分别为:y = 0.944 3 x+0.317，(R²=0.999 8); y = -0.237 6 x+0.192 5(R²=0.999 6);端基滴定法测定聚合度时第一突跃点明显，而第二突跃点不明显或无突越显示，且测定值偏小;纸层析法可同时测得不同聚合态磷，所得聚合度较端基滴定法更为准确。对混合标样聚合率测定发现，不同测定方法聚合率相对误差表现为:纸层析＞钼黄比色法＞钼蓝比色法(8.73%＞5.55%＞1.20%)。【结论】农用肥料级水溶性聚磷酸铵，纸层析法与钼蓝比色法应可被作为测定聚磷酸肥料聚合度及聚合率合理的测定方法。

关键词: 聚磷酸铵; 端基滴定; 纸层析; 钼蓝比色; 钼黄比色

Abstract: 【Objective】 As a new type of P fertilizer, it is urgent and necessary to establish suitable method to characterize the quality of water-soluble ammonium polyphosphate. However, no relevant standard determination method is available so far.【Method】In this study, methods of end-group titration and paper chromatography were used to determine polymerization degree of standard and fertilizer samples; Molybdenum blue colorimetry, molybdenum yellow colorimetry and paper chromatography were employed to determine polymerization rate of standard and fertilizer samples.【Result】The calibration curves obtained from end-group titration and paper chromatography were y = 0.944,3 x+0.317 (R²=0.999,8) and y = -0.237,6 x+0.192,5 (R²=0.999,6) , respectively, both were significantly fitted; an obvious change was found at the first jump point while there was no significant change at the second jump point, and a low detection value was gained in end-group titration method; Different forms of polymeric fractions were detected simultaneously via paper chromatography measurement, and the value determined by paper chromatography measurement was more accurate than that with end-group titration method. Regarding the measurement method of polymerization rate, it was found that the relative errors obtained from different measurement methods following the order of: paper chromatography (8.73%) > colorimetry with molybdenum yellow (5.55%) > molybdenum blue colorimetry (1.20%).【Conclusion】Briefly, paper chromatography and molybdenum blue colorimetry exhibit significant advantages on determination of polymerization degree and polymerization rate of water-soluble ammonium polyphosphate fertilizer, thus these could be regarded as suitable methods for characterizing the quality of polyphosphate fertilizer.

Key words: ammonium polyphosphate; end-group titration; paper chromatography; molybdenum blue colorimetry; molybdenum yellow colorimetry

中图分类号:

S14
O653

高艳菊, 刘腾, 亢龙飞, 关钰, 褚贵新. 聚磷酸铵肥料聚合度与聚合率测定方法比较[J]. 新疆农业科学, 2017, 54(10): 1822-1831.

GAO Yan-ju, LIU Teng, KONG Long-fei, GUAN Yu, CHU Gui-xin. Comparison of Different Measurement Methods for Determination of Polymerization Degree and Polymerization Rate of Water-soluble Ammonium Polyphosphate Fertilizer[J]. Xinjiang Agricultural Sciences, 2017, 54(10): 1822-1831.

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