竹材纤维板甲醛释放量检出限评定研究

Evaluation Study on Detection Limit Assessment Method for Formaldehyde Emission in Artificial Bamboo Fiberboard

【目的】确定竹材人造板产品甲醛释放量检测方法的检出限,为检测机构进行甲醛释放量检测工作提供参考。【方法】依据HJ 168—2020规定的空白偏差法,按照GB/T 17657—2022中1 m^(3)气候箱法和干燥器法对竹材人造板甲醛释放量的方法检出限进行评定。【结果】1 m^(3)气候箱法MDL为0.013 mg·m^(-3)(10 mm光程比色皿)和0.006 mg·m^(-3)(50 mm光程比色皿),干燥器法MDL为0.035 mg·L^(-1)(10 mm光程比色皿)和0.022 mg·L^(-1)(50 mm光程比色皿);甲醛标液的精密度和正确度均符合要求,竹木纤维板实际检测值呈现良好的重复性。【结论】2种方法检出限评定结果均满足预期要求;50 mm光程比色皿分析获得的检出限更低且竹木纤维板实测值结果符合预期要求,因此50 mm光程比色皿更适用于低浓度甲醛释放量的竹材人造板检测分析与评定。

【Objective】To determine the detection limit of formaldehyde emission detection methods for bamboo-based panels,and provide reference for formaldehyde emission detection work of testing agencies.【Method】According to the blank deviation method specified in HJ 168—2020,the detection limit of formaldehyde release from the artificial bamboo fiberboard boards by using the 1 m 3 climate box method and desiccator method in GB/T 17657—2022 was evaluated.【Result】The results showed that the MDL of the 1 m^(3) climate chamber method was 0.013 mg·m^(-3)(10 mm optical path cuvette)and 0.006 mg·m^(-3)(50 mm optical path cuvette),while the MDL of the desiccator method was 0.035 mg·L^(-1)(10 mm optical path cuvette)and 0.022 mg·L^(-1)(50 mm optical path cuvette).The precision and accuracy of the formaldehyde standard solution met the requirements,and the actual detection values of bamboo-wood fiberboard showed good repeatability.【Conclusion】The evaluation results of the detection limits of the two methods met the expected requirements;The evaluation limit of the 50 mm optical path cuvette was lower and the actual measurement results of bamboo and wood fiberboard met the expected requirements,therefore,50 mm optical path cuvette is more suitable for the analysis and evaluation of low concentration formaldehyde in bamboo-based panels.