[Evaluation of measurement uncertainty of welding fume in welding workplace of a shipyard].
OBJECTIVE
To evaluate the measurement uncertainty of welding fume in the air of the welding workplace of a shipyard, and to provide quality assurance for measurement.


METHODS
According to GBZ/T 192.1-2007 "Determination of dust in the air of workplace-Part 1: Total dust concentration" and JJF 1059-1999 "Evaluation and expression of measurement uncertainty", the uncertainty for determination of welding fume was evaluated and the measurement results were completely described.


RESULTS
The concentration of welding fume was 3.3 mg/m(3), and the expanded uncertainty was 0.24 mg/m(3). The repeatability for determination of dust concentration introduced an uncertainty of 1.9%, the measurement using electronic balance introduced a standard uncertainty of 0.3%, and the measurement of sample quality introduced a standard uncertainty of 3.2%.


CONCLUSIONS
During the determination of welding fume, the standard uncertainty introduced by the measurement of sample quality is the dominant uncertainty. In the process of sampling and measurement, quality control should be focused on the collection efficiency of dust, air humidity, sample volume, and measuring instruments.
Tianjin Centers for Disease Control and Prevention, Tianjin 300011, China.
Jie
J
Ren
Yanrang
Y
Wang
D000395:Air Pollutants, Occupational / Q000032:analysis* / Q000592:standards*; D005740:Gases / Q000032:analysis*; D035501:Uncertainty; D014896:Welding; D017132:Workplace / Q000592:standards*
D000395:Air Pollutants, Occupational; D005740:Gases