Table 2.

Arsenic species in exfoliated BECs (ng As/mg protein) and urine (ng As/mL).

	BECs		Urine
	Mean ± SD	Range	Mean ± SD	Range
iAs	2.41 ± 1.75	0.06–5.89	36.6 ± 60.2	1–201
MAs	0.80 ± 0.66	0.03–2.43	42.3 ± 90.2	1–342
DMAs	2.19 ± 1.5	0.10–5.75	221.5 ± 440.5	2.8–1,449
iAs+MAs+DMAs	5.41 ± 3	0.18–11.35	300.5 ± 583.5	4.8–1,947
%iAs	42 ± 16.1*	20–72.8	17 ± 7.7	8.4–35.0
%MAs	15 ± 5.6	4.1–26.3	13 ± 6.1	2.6–30.1
%DMAs	43 ± 17.6*	13.7–65	69 ± 12.3	36.8–85.9
MAs/iAs	0.4 ± 0.21*	0.07–0.92	0.8 ± 0.40	0.1–2.0
DMAs/MAs	3.8 ± 2.75*	0.70–10.5	7.8 ± 7.4	1.2–29.6
DMAs/iAs	1.3 ± 0.90*	0.19–3.2	5.0 ± 2.6	1.1–9.5

Results are shown for 21 urine samples and 20 BEC samples; levels of As species in one BEC sample were < DLs of the method.

^*Value in BECs is significantly different (p < 0.05) compared with the corresponding value in urine.