Lowering reporting limit values for respirable crystalline silica analysis by X-ray diffraction in preparation of the 0.025 mg/m3 occupational exposure limit

被引：0

作者：

Ichikawa, Akemi ^{[1
]}

Corke, Elisabeth ^{[1
]}

Moubarak, Anne-Marie ^{[1
]}

Mazereeuw, Martin ^{[1
]}

Volpato, John ^{[1
]}

Weller, Michael ^{[2
]}

Clemence, Dennis ^{[2
]}

机构：

[1] SafeWork NSW, TestSafe Australia, 9-15 Chilvers Rd, Thornleigh, NSW 2120, Australia

[2] SafeWork NSW, Hyg & Toxicol, Chem Explos & Safety Auditing Directorate, 4 Parramatta Sq,12 Darcy St, Parramatta, NSW 2150, Australia

来源：

ANNALS OF WORK EXPOSURES AND HEALTH | 2024年 / 68卷 / 08期

关键词：

Direct-on-Filter method; alpha-quartz; respirable crystalline silica; RCS; silica exposure; X-ray diffraction;

D O I：

10.1093/annweh/wxae066

中图分类号：

R1 [预防医学、卫生学];

学科分类号：

1004 ; 120402 ;

摘要：

Internationally, respirable crystalline silica (RCS) occupational exposure limits (OELs) are being reassessed and, in some jurisdictions, lowered, putting pressure on the capabilities of the analytical techniques used to achieve robust analyses and reliable detection limits. In preparation of a lower OEL, options for lowering the limit of detection (LoD) for RCS analysis have been assessed. Using a Direct-on-Filter X-Ray Diffraction (XRD) analysis under reduced scan speeds in combination with low-noise RCS sampling filters, an LoD of 0.25 mu g/filter and a limit of quantification (LoQ) of 0.82 mu g/filter can be achieved. Both limits would translate in an LoD of 0.24 mu g/m(3) and LoQ of 0.78 mu g/m(3) when sampling respirable dust for 8 h at 2.2 L/min, providing a technical solution to monitor exposures at the proposed OEL of 0.025 mg/m(3) (25 mu g /m(3)) and below, with general sampling conditions as typically applied in Australia. This is the first report showing that the OEL of 0.025 mg/m(3) (25 mu g /m(3)) is measurable by one of the standardized, direct-on-filter XRD methods.

引用

页码：859 / 866

页数：8