目的 筛选适宜的总有机碳（TOC）校准物质,进一步优化燃烧氧化法测定生物降解塑料中TOC的检测方法,有效提升检测结果的准确性与可靠性。方法 初选出草酸、邻苯二甲酸、邻苯二甲酸氢钾、蔗糖、纤维素和碳酸钙六种候选校准物质,设计一系列实验,从多方面考察这六种校准物质测试塑料中TOC的适用性。结果 通过测定六种候选校准物质的水分含量、燃烧产水量与热稳定性并开展物质间互校TOC测试、已知组分实际样品验证及未知组分塑料样品的精密度与回收率试验,结果表明纤维素和蔗糖在各项测试中均表现更佳。结论 使用纤维素或蔗糖作为燃烧氧化法测试生物降解塑料中TOC的定量校准物质具有较好的可行性。
Abstract
The work aims to select suitable total organic carbon (TOC) calibration compounds to further optimize the combustion oxidation method for the determination of TOC in biodegradable plastics and enhance the accuracy and reliability of analytical results. Six candidate calibration compounds, namely oxalic acid, phthalic acid, potassium hydrogen phthalate, sucrose, cellulose and calcium carbonate, were initially screened out. A series of experiments were designed to investigate the applicability of the six compounds for determining TOC in plastics from multiple aspects. The moisture content, water yield during combustion, and thermal stability of the six candidate calibration compounds were determined. Furthermore, mutual calibration TOC tests among these compounds, validation using actual samples with known compositions, as well as precision and recovery tests on plastic samples with unknown compositions were conducted. The results demonstrated that cellulose and sucrose exhibited superior performance in all tests. In conclusion, it is feasible to use cellulose or sucrose as quantitative calibration compounds for testing TOC in biodegradable plastics by the combustion oxidation method.
关键词
燃烧氧化法 /
生物降解塑料 /
总有机碳（TOC） /
校准物质
Key words
combustion oxidation method /
biodegradable plastics /
total organic carbon (TOC) /
calibration compound
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基金
广东省重点研发计划项目（2025B0202120004）
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