Two different analysis methods were used for personal samples and bulk samples. All analyses were conducted at the laboratory of Hong Kong Polytechnic University. The LOD and LOQ (limit of quantification) were 0.01 mg and 0.03 mg respectively.
Two different analysis methods were used for personal samplesand bulk samples. All analyses were conducted at the laboratory ofHong Kong Polytechnic University. The LOD and LOQ (limit ofquantification) were 0.01 mg and 0.03 mg respectively.