乙二醇單甲基醚暴露被動式採樣器現場測試評估

assessment of 2-methoxy ethanol

本研究係以市售3M 3500 被動式採樣器，針對高極性有害物乙二醇單甲基醚，在高濕工作環境下，進行現場性能測試評估。測試結果以成對樣品t 檢定做統計分析，在0.17-163 ppm 濃度範圍內，並未發現主動式與被動式採樣器有統計上之差異。線性回歸分析發現二種採樣器93 對成對樣品之相關係數高達0.992以上，斜率為0.973。二者平均濃度差為 -0.34 ppm，平均百分相對誤差為3.50%。48 對二重複主動式採樣及52 對二重複被動式採樣之intraclass 相關係數分別為0.994 及0.989。六重複主動式、被動式、及主動式加乾燥管三種採樣方式，在高、中、低不同暴露濃度現場之採樣結果，顯示其平均精密度分別為3.84%，7.14%，及5.12%。在36.3 mL/min之低流率採樣條件下，發現濕度之影響並不明顯。因此本研究之結論為考慮精密度、準確度及現場環境干擾效應，以3M 3500 被動式採樣器進行乙二醇單甲基醚之暴露評估，可以獲致與傳統主動採樣相當一致之測定結果。

This paper presents a field evaluation of 3M 3500 passive badges to measure a highly polar compound 2-methoxy ethanol (ME) in a high humidity working environment. No statistical difference was found between the passive badges and active samplers by paired-sample t test. Linear regression analysis showed a high correlation (r > 0.992, slope = 0.973, n = 93) between the passive and active samples over the exposure range of 0.17 to163 ppm. The mean concentration difference was - 0.34 ppm and the mean relative error was 3.50%. The intraclass correlation coefficients of 48 duplicate active samples and 52 duplicate passive samples were 0.994, and 0.989 respectively. The precision of replicate passive, active, and active/drying tube samples (n = 6) collected at three different exposure areas are 3.84%, 7.14%, and 5.12% respectively. Humidity effect was insignificant at the low sampling rate (36.3 mL/min) used in this study. It is therefore concluded that using the passive sampler to assess ME exposure resulted in a comparable finding to that of active sampler collection with respect to accuracy, precision, and effects from the environmental interference.