Elemental Contents in Hair of Children from Two Regions in Dar Es Salaam

Table 1

The concentration levels of elements (μg/g) in four-standard reference materials obtained in this work (Exp.) together with the certified values (Cert.).

	Hair (GBW07601)		Urban particulate (SRM 1648)		Apple leaves (SRM 1515)		Orchid leaves (SRM 1571)
	Exp.	Cert.	Exp.	Cert.	Exp.	Cert.	Exp.	Cert.
Na	139 ± 5.9	152 ± 10	4028 ± 21	4250 ± 20	29 ± 1	24 ± 1	81 ± 0.7	82 ± 6
K%			1.0±0.05	1.1±0.01			1.4±0.02	1.5±0.07
Al					277 ± 2	286 ± 9
S%	4.5±0.1	4.3±0.2
Cl	26 ± 4	35*			564 ± 6	579 ± 23
V	<0.2	0.03*			0.26±0.03	0.3±0.03
Mn	6 ± 0.2	6.3±0.5			52 ± 0.2	54 ± 3
Mg					2583 ± 15	2710 ± 80
Ca%					1.4±0.02	1.5±0.02
Cu	10 ± 0.8	10.6±0.7	545 ± 19	609 ± 27	7 ± 0.6	5.6±0.2	12 ± 0.7	12 ± 1
Zn	187 ± 12	190 ± 5	4305 ± 53	4760 ± 140			22 ± 0.6	25 ± 2
Br	0.3±0.01	0.4*	494 ± 3	500 ± 25	1.2±0.1	1.8	9 ± 0.1	10 ± 1
Sr	21 ± 3	24 ± 1		207 ± 15			30 ± 4	37 ± 3
I	0.7±0.1	0.8*
Ba	17 ± 0.4	17 ± 1	667 ± 92	737 ± 40	44 ± 1	49 ± 2	42 ± 4	44 ± 4
Dy	<0.03	0.017
U	0.1±0.001	0.09*
As	0.3±0.001	0.28±0.04	115 ± 1	115 ± 10			11 ± 0.1	10 ± 1
Cd	<4	0.11±0.02	79 ± 9	75 ± 7				0.1±0.02
Sb	0.082±0.004	0.1±0.01	46 ± 2	45 ± 2			3 ± 0.1	3 ± 0.3
La	0.055±0.006	0.05±0.01	36 ± 0.5	44 ± 2			1 ± 0.02
Sm	0.012±0.002	0.012*	4 ± 0.03	4 ± 0.3			0.1±0.001
Au	0.003±0.001	0.0025*
Sc	8 ± 0.1**	8 ± 1**	6 ± 0.2	7 ± 0.1			0.1±0.002	0.1±0.01
Cr	<0.260	0.37±0.05	357 ± 9	403 ± 12			2.2±0.1	2.6±0.3
Fe	52 ± 6	54 ± 6*	3.7±0.1%	3.9±0.1%			252 ± 11	300 ± 28
Co	0.07±0.006	0.07±0.01	16 ± 0.4	18 ± 2			0.14±0.01	0.16±0.04
Se	0.60±0.06	0.60±0.03	25 ± 9	27 ± 1				0.08±0.01
Ag	<0.07	0.029±0.006	6 ± 0.3	6 ± 0.2
Ce	0.15±0.01	0.12±0.03	56 ± 1	55 ± 4			1 ± 0.1	1 ± 0.1

* Not certified.
**ng/g.