A pilot project was conducted to determine the effect of common construction dusts as interferences in a new portable end-of-shift (EoS), direct-on-filter (DoF) sampling and analysis method for respirable crystalline silica (RCS), in this case, quartz. Construction dusts were prepared from plaster, drywall, cement and brick by grinding, aerosolizing, and collecting respirable dust with high flow rate cyclones. Filters were loaded with different levels of commercial α-quartz powder Min-u-Sil 5, and different levels of interfering dusts, singly and in combination. Samples were analyzed by Fourier Transform Infrared Spectroscopy (FTIR). Good correlations were found between nominal quartz loading (0 µg, 25 µg, 50 µg, and 100 µg) adjusted for quartz in the interfering dust and FTIR absorbance alone and in the presence of all interfering dusts. The slopes of the correlations were similar whether the loading was quartz without interference, or with plaster, drywall, and cement dusts, regardless of quantity. The results show that (a) plaster and drywall dusts do not interfere substantially; (b) cement does not interfere, but a change in the intercept suggests an effect on the background absorbance of the filter; and (c) in addition to having a substantial quartz content, brick dust contains an additional material, probably a silicate mineral, which interferes with the quartz peak. Thus, the presence of cement leads to lower quartz values and brick leads to higher values, but overall, 83% of the quartz contents predicted from the calibration data agreed within 50% of the adjusted nominal loadings within the range 20–110 µg. This result is encouraging given the high levels of interfering dusts. Nine samples loaded with smaller amounts of all four dusts together gave results within 25% of the adjusted nominal loadings. A single mixture addition of the dusts to the filter gave tighter variance in results than sequential additions. Unexpectedly, the two Certified Reference Materials (CRMs) 1878a and 1878b, gave different results when used to calibrate XRD analysis of Min-u-Sil 5.

在此进行了一个试点项目，以确定常见的建筑粉尘对可吸入式结晶二氧化硅（RCS）的新型便携式移动终点（EoS），直接过滤器（DoF）采样和分析方法的干扰影响。表壳，石英。用灰泥，干式墙，水泥和砖通过打磨，雾化和收集高流速旋风分离器的可吸入粉尘来制备建筑粉尘。过滤器单独或组合装有不同含量的市售α-石英粉末Min-u-Sil 5和不同含量的干扰粉尘。通过傅立叶变换红外光谱法（FTIR）分析样品。在干扰粉尘中为石英调整的标称石英负载（0 µg，25 µg，50 µg和100 µg）之间存在良好的相关性，而在所有干扰粉尘的存在下，仅FTIR吸收也是如此。无论载荷是无干扰的石英还是石膏，石膏板和水泥粉尘，无论数量如何，相关性的斜率都相似。结果表明：（a）灰泥和干墙粉尘基本上没有干扰；（b）水泥不产生干扰，但截距的变化表明对过滤器的背景吸收有影响；（c）除含有大量石英外，砖屑还含有其他物质，可能是硅酸盐矿物，会干扰石英峰。因此，水泥的存在会导致较低的石英值，而砖块会导致较高的石英值，但总体而言，根据校准数据预测的83％的石英含量在20-110 µg范围内的调整标称载荷的50％内。考虑到高水平的粉尘干扰，该结果令人鼓舞。九个样品中全部四种粉尘的含量加在一起，得出的结果在调整后的名义载荷的25％以内。将粉尘单次添加到过滤器中，与顺序添加相比，结果差异更小。出乎意料的是，两种校准参考材料（CRM）1878a和1878b在用于校准Min-u-Sil 5的XRD分析时给出了不同的结果。