l. The average(GM, GSD) concentrations of formaldehyde by sampling methods were 0.11(4.43) ppm by...
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l. The average(GM, GSD) concentrations of formaldehyde by sampling methods were 0.11(4.43) ppm by 1M, 0.27(2.03) ppm by SS, and 0.29(2.04) ppm by PB, respectively. The concentrations