Annals of work exposures and health · 2026
Comparison of respirable dust concentrations between gravimetric weighing and real-time dust monitoring equipment in non-mining industries.
СтатьяСравнительное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Shai Mathokone Jonas, Sebola Lerato Perseverence, Ramatsoma Hlologelo, Du Preez Karen Louise, Manganyi Jeanneth, Young Monica Magdalena
Аннотация
BACKGROUND: Gravimetric weighing remains the gold standard for mass concentration assessments; however, real-time (RT) instruments offer advantages such as immediate feedback and temporal resolution. This study evaluated the comparability of Nanozen DustCount 9000 RT measurements with its gravimetric weighing in non-mining industrial environments.
METHOD: Task-based stationary sampling was conducted at 11 sites in the Gauteng Province, South Africa, producing 20 paired gravimetric and RT measurements. RT outputs were analyzed as raw (RT) and density-adjusted (adjusted-RT) values. Comparability was assessed using Wilcoxon signed-rank tests, Bland-Altman analysis, and regression of proportional bias.
RESULTS: No significant differences were observed between gravimetric and RT (P = 0.067) or gravimetric and adjusted-RT (P = 0.277). Bias increased with higher concentrations, but measurements below 1 mg/m3 showed no significant proportional bias (gravimetric versus RT: R2 = 0.06, P = 0.34; gravimetric versus adjusted-RT: R2 = 0.02, P = 0.59).
CONCLUSION: The RT measurements demonstrated close correspondence with gravimetric results obtained from the Nanozen DustCount 9000 built-in filter cassette, particularly at concentrations below 1 mg/m3, suggesting this threshold as a cutoff point for reliable agreement.
METHOD: Task-based stationary sampling was conducted at 11 sites in the Gauteng Province, South Africa, producing 20 paired gravimetric and RT measurements. RT outputs were analyzed as raw (RT) and density-adjusted (adjusted-RT) values. Comparability was assessed using Wilcoxon signed-rank tests, Bland-Altman analysis, and regression of proportional bias.
RESULTS: No significant differences were observed between gravimetric and RT (P = 0.067) or gravimetric and adjusted-RT (P = 0.277). Bias increased with higher concentrations, but measurements below 1 mg/m3 showed no significant proportional bias (gravimetric versus RT: R2 = 0.06, P = 0.34; gravimetric versus adjusted-RT: R2 = 0.02, P = 0.59).
CONCLUSION: The RT measurements demonstrated close correspondence with gravimetric results obtained from the Nanozen DustCount 9000 built-in filter cassette, particularly at concentrations below 1 mg/m3, suggesting this threshold as a cutoff point for reliable agreement.