目的 建立利用燃烧氧化法测试包装用生物降解塑料中TOC含量的方法。方法 对已知含无机碳酸盐填料的样品，分别用盐酸进行酸化处理和不经酸化处理，研究用酸化样品对消除样品中无机碳酸盐干扰的效果;在不同温度下考察薄层纤维素的TOC测定结果，对燃烧温度进行优化;在优化后的条件下，采用碳酸钙作为碳含量的标准物质，对包装用生物降解塑料实际样品进行定量测试。结果 经酸化处理后的塑料样品，TOC检测值与理论值偏差仅为−1.22%～+1.42%，而不经酸化处理的塑料样品，实测值与理论计算值的偏差为+7.40%～+29.36%，可见经过酸化处理所得结果更为准确;在950 ℃到1 250 ℃区间内，对薄层纤维素样品分别在不同温度下进行燃烧氧化测试，发现最佳燃烧温度为1 100 ℃;利用碳酸钙为标准品绘制标准工作曲线，结果表明在0.6～24 mg碳含量内，标准工作曲线线性关系良好;对7个生物降解塑料实际样品进行检测，TOC实测值与理论计算值的偏差在−4.26%～+3.47%。结论 研究表明，该方法操作简便、线性良好，精密度和准确性高，适用于生物降解塑料中TOC的检测。

The work aims todetermine the TOC in biodegradable plastics for packaging by the combustion oxidation method. Samples with known inorganic carbonate fillers were treated with hydrochloric acidification and without acidification respectively, and the differential effect of eliminating the interference of inorganic carbonate by acidifying samples was studied. The combustion temperature was optimized by investigating and comparing at different temperature from the TOC results of thin-layer cellulose. Under the optimized conditions, calcium carbonate was used as the standard material for carbon content, and the actual sample of biodegradable plastics for packaging was quantitatively tested. The test measurements showed that the deviation between the measured value and the theoretical value of the plastic sample after acidification was only -1.22%～+1.42%, while the deviation between the measured value and the theoretical value of the plastic sample without acidification was +7.40%～+29.36%, which indicated that the test result after acidification was more accurate; Besides, the combustion and oxidation tests were carried out at 950 ℃～1 250 ℃ respectively, and the optimal combustion temperature was found to be 1 100 ℃; The standard calibration curve was protracted with calcium carbonate as the standard material. In addition, the results showed that the standard calibration curve had a good linear relationship in the range of 0.6 mg to 24 mg carbon content; Seven biodegradable plastic samples were tested, and the deviation between the measured TOC and the theoretical calculated value was between -4.26% and +3.47%. The study shows that the method is simple and has great linearity, high precision and accuracy. It is suitable for the determination of TOC in biodegradable plastics.