Bio:
Email: 454710566@qq.com
王春涛(1988—),男,硕士,高级化工工程师,主要从事微生物肥料及腐殖酸生物技术研究;454710566@qq.com
由于风化煤中有机质含量较高,物理性质因产地不同存在差异,采用行业标准《有机肥料》(NY/T 525—2021)中的重铬酸钾氧化法测定风化煤中有机质含量时,测定结果的重复性不理想。以新疆和内蒙古的风化煤为样品,开展了样品粒径、含水量、称样量及测定条件对风化煤中有机质含量测定结果影响的试验研究。结果表明:将风化煤粉碎至过0.200 mm孔径筛、风干至空气干燥状态后,控制称样量为0.1~0.2 g(有机碳质量≤80 mg),在氧化过程中每隔5 min摇动1次三角瓶,可以实现风化煤中有机质含量的准确测定;平行测定结果的最大绝对差值≤0.7%,能满足NY/T 525—2021中的要求;并且改进后方法测得的有机质质量分数比NY/T 525—2021中方法测得的高7.9%~9.1%,说明改进后的方法对风化煤中有机质的氧化更完全。
Due to the high content of organic matter in weathered coal and differences in physical properties depending on the place of origin, the repeatability of the measurement results is not ideal when using the potassium dichromate oxidation method in the industry standard "Organic Fertilizer" (NY/T 525—2021) to determine the organic matter content in weathered coal. An experimental study is conducted on the influence of sample particle size, moisture content, sample weight, and measurement conditions on the determination of organic matter content in weathered coal from Xinjiang and Inner Mongolia. The results show that after crushing weathered coal through a 0.200 mm sieve and drying to an air dry state, controlling the sample weight to 0.1-0.2 g (organic carbon mass ≤ 80 mg) and shaking the triangular flask every 5 minutes during the oxidation process can accurately determine the organic matter content in weathered coal. The maximum absolute difference of parallel measurement results is ≤ 0.7%, which meets the requirements of NY/T 525—2021, and the organic matter mass fraction measured by the improved method is 7.9% to 9.1% higher than that measured by the method in NY/T 525—2021, indicating that the improved method has a more complete oxidation of organic matter in weathered coal.
赵瑞, 张保林, 于淼. 风化煤过氧化氢氧化-加氨制腐植酸铵的研究[J]. 信阳师范学院学报(自然科学版), 2010, 23(4): 582-586. doi:10.3969/j.issn.1003-0972.2010.04.027