气相色谱法测定新型多元复合液肥中二羧酸

Determination of Dicarboxylic Acids in a New Compound Liquid Fertilizer by Gas Chromatography

建立了新型多元复合液肥中丁二酸、戊二酸、己二酸的气相色谱分析方法。色谱条件：５％ＳＥ－３０不锈钢填充柱，程序升温，内标物为丙二酸二乙酯，３种二元酸二乙酯分别在２．３～９．３μｇ，１０．８～４３．２μｇ和２．８～１１．０μｇ质量范围内，其样品质量与样品峰面积和内标峰面积之比呈良好的线性关系，相关系数ｒ≥０．９９５５。

A method for determination of succinic acid, glutaric acid and adipic acid in a new compound liquid fertilizer by gas chromatography is described. The sample after dried at 80℃ was extracted by ethyl alcohol, and then esterified in the presence of BF 3. The esterified derivatives were injected into a gas chromatograph with a 5% SE 30 packed column, programmed from 140 ℃ (held for 1 min) to 160 ℃ (held for 6 min) at a rate of 6 ℃/min. Internal standard was diethyl malonate. Calibration curves of the three diethyl esters were linear in the ranges of 2.3 9.3 μg, 10.8 43.2 μg and 2.8 11.0 μg respectively.