Toluene and Heavy Metals in Small Automotive Refinishing Shops and Personal Protection of the Workers in Nakhon Si Thammarat, Thailand

Table 1

Correlation coefficient, recovery rate, LOD, and LOQ of the analytical procedures.

Sample	Compound	Correlation coefficient	Recovery (%)	LOD (ppb)	LOQ (ppb)
Area air samples	Toluene	0.9980	N/A	2.8	9.3
Urine	Hippuric acid	0.9992	N/A	10.8	36.1
Respirable dust	Lead	0.9999	54.1	4.5	15.0
	Chromium	0.9995	87.6	1.8	6.0
	Cadmium	0.9989	61.6	0.3	1.0
Hand dust wipe	Lead	0.9999	74.0	5.4	18.0
	Chromium	0.9999	83.2	0.9	3.0
	Cadmium	0.9990	80.0	0.6	2.0