Rawat N S
Sci Total Environ. 1982 Apr;23:47-54. doi: 10.1016/0048-9697(82)90120-6.
The respirable coal dust samples were collected from the mine atmosphere during drilling of coal seams using 'Hexlet' apparatus. Sixteen dust samples were collected from each three different seams for investigations. After destruction of the organic matter by wet oxidation and filtering off the clay and silica, Fe, Ca, Mg, Na, K, Mn, Zn, Cu, Cd and Ni were determined directly in the resulting solution by atomic absorption spectrophotometric methods. The x-ray diffraction studies have shown the presence of kaolinite, quartz, pirrsonite, and beidellite clay minerals in the coal dust. The mass-size distribution of the coal dust has been studied by using micron photosizer. The results showed that the distribution are unimodal, asymmetric, and positively skew. Although the assumption of log-normality was useful in interpreting the results, closer observations indicated that the relationship between the size and weight of the particles can be represented by a second degree parabolic equation w = a + bS + cs2, where W and S are weight and size of the particles and a, b and c are constants. This equation helps us to characterise the mass of the respirable particles if the size is known. The studies throw light on the nature and mode of trace elements found in Indian Coal as well as on the causes of respiratory disease, pneumoconmiosis, affecting the workers in the mine environmental condition.
使用“Hexlet”仪器在煤层钻孔过程中从矿井大气中采集可吸入煤尘样本。从每三个不同煤层中采集16个粉尘样本进行调查。通过湿式氧化破坏有机物并滤除粘土和二氧化硅后，采用原子吸收分光光度法直接测定所得溶液中的铁、钙、镁、钠、钾、锰、锌、铜、镉和镍。X射线衍射研究表明煤尘中存在高岭石、石英、泡碱和贝得石粘土矿物。使用微米粒度分析仪研究了煤尘的质量-粒度分布。结果表明，分布为单峰、不对称且正偏态。尽管对数正态假设在解释结果时很有用，但更仔细的观察表明，颗粒尺寸与重量之间的关系可以用二次抛物线方程w = a + bS + cs2表示，其中W和S分别是颗粒的重量和尺寸，a、b和c是常数。如果已知尺寸，该方程有助于我们表征可吸入颗粒的质量。这些研究揭示了印度煤炭中微量元素的性质和存在方式，以及在矿井环境条件下影响工人的呼吸系统疾病——尘肺病的病因。
