煤中全硫测定方法的研究

介绍了中国国标规定的4种煤中全硫的测定方法主要有艾士卡法、高温燃烧中和法、库仑滴定法和红外光谱法。采用不同方法对5种标准煤样进行全硫测定对比实验，结果表明：艾士卡法的准确度最高，艾士卡法、库仑滴定法、红外光谱法的测定值无显著性差异，与标准值的相关性均较好，且均在标煤的不确定度范围内；高温燃烧中和法测定结果与标准值的相关性最差，测定低硫标煤时结果偏高，偏离标煤的不确定度，测定高硫煤样时结果偏低。通过对比4种方法的原理、适用煤种、优缺点及应用场合，有针对性地提出减小测量误差的措施，如严格按照标准采样、制样、测样，加强质量管理，定期用标样对仪器进行检定和校验等，最大限度确保检测数据的真实性、准确性和可靠性。

Determination of total sulfur in coal

Introduce four methods for total sulfur determination in coal, regulated by national standard, which are Eschka method, heat burning neutralization, coulometrie method and infrared method. Compare these methods with five certified reference coal. The results show that, Eschka method achieve high accuracy, the data gotten by Eschka method, coulometric method and infrared method have no significant difference. There is good correlation between measured values and standard values. The measured values gotten by heat burning neutralization are high when determinating low sulfur coal, while the values are low when the coal samples are high sulfur coal. Compare the measuring principle, application scope, adaptable coal, merits and demerits of these methods, provide corresponding measures to minimize measurement errors, such as strictly following the standards when collecting, preparing and measuring samples, reinforceing quality control, checking instruments regular with certified reference coal.