선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The attempted measurements were both long-term (8h-TWA) to evaluate total exposure from all occupational sources and short-term(task based samples with duration of less than one hour) to investigate identified tasks with potentially elevated exposures. For assessment of 8h-TWA styrene in air, consecutive two samples were taken from one worker by considering breakthrough.
- For assessment of 8h-TWA styrene in air, consecutive two samples were taken from one worker by considering breakthrough. The flow rates(0.2 L/min for short-term sampling and 0.1 L/min for long-term sampling) of portable sampling pumps(LFS-113, Sensidyne, LP) used to collect samples were selected to ensure that sufficient contaminants were collected on the samples for analysis. All pump flow rates were calibrated before and after sampling using a primary flow calibrator(Gilian Gilibrator 2 Calibration System; Sensidyne, LP).
- The major sources of styrene were evaluated by a review of the material safety data sheets(MSDS) of raw materials used and ingredient analysis using gas chromatography with mass spectrometry(GC-MS; HP 6890 plus, Agilent 5973, USA). Each sample was collected at 10 ul with a micro syringe, diluted with methanol, and analyzed with GC-MS.
- ) samples were analyzed for styrene by gas chromatography with flame ionization detector using National Institute for Occupational Safety and Health(NIOSH) method 1501 (NIOSH, 2003) in Wonjin Institute for Occupational and Environmental Health laboratory that are being quality controlled under the NIOSH proficiency analytical testing program. The results of analysis were adjusted by analyzing blanks and desorption efficiency with each batch of samples analyzed.
- There were a total of 5 workers including one sprayer who conducted coating by spraying the mixture of FRP, UPR, hardner and toner, three helpers engaged in rolling to prevent bubble formation during coating and for even lamination of the surface, and one inspector who undertook the examination of the final product quality. In terms of job characteristics of 5 workers, a sprayer conducted coating by spraying with the mixture of FRP, UPR, hardner and toner on a tank, helper 1 and helper 2 did rolling operation next to and on the opposite side of a sprayer, respectively around the tank, and helper 3 was assisting the helper 1 or helper 2.
데이터처리
- Statistical analyses were performed by Student’s t-test for short-term exposure levels by tasks and MA concentrations in urine by shifts or exposure groups.
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