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对Montgomery(1962)比色法测定有机酸总量的方法作了若干改进。根据化学反应的平衡关系,将欲测试的土壤提取液水浴蒸干脱水,大大提高了有机酸的酯化程度,也就提高了测定的准确度。由于提取液浓缩至干,故测定一般可不受吸取的提取液体积和其中有机酸浓度高低的影响。结合温度、时间、pH等条件试验得到了测定的最佳条件。乙酸和丁酸的回收率分别可达99%和102%。几种有机肥料淹水培育10天用气相色谱测定的乙酸含量为本文提出的比色法测定总量的86%。采用这一方法测定土壤有机酸的量,可以在一定程度上反映有机物在土壤中腐解时产生有机酸的实际情况。
A number of improvements have been made to the method for the determination of organic acids by Montgomery (1962) colorimetry. According to the chemical reaction of the balance between the soil extract to be tested in the water bath evaporated to dehydration, greatly increased the degree of esterification of organic acids, also increased the accuracy of the determination. As the extract concentrated to dry, it is generally determined not to be absorbed by the extract volume and the concentration of organic acids in which the impact. Combined with temperature, time, pH and other conditions tested to determine the best conditions. Acetic acid and butyric acid recovery rates of up to 99% and 102%. Several organic fertilizers were flooded for 10 days and the acetic acid content determined by gas chromatography was 86% of the total colorimetric assay proposed in this paper. The determination of the amount of organic acids in soil by this method can reflect the actual situation of organic acids produced when the organic matter decomposes in the soil to a certain extent.