Table 6.

Concentration levels of heavy metals (µg·g⁻¹) in the investigated henna samples.

Henna Samples	Color	Place of Origin	Concentration of Heavy Metal (Mean ± SD)
			Pb	Cd	As
H1	Black	India	20.47 ± 0.39	8.81 ± 0.01	0.56 ± 0.02
H2	Green	Libya	0.81 ± 0.02	6.57 ± 0.15	0.90 ± 0.01
H3	Green	Libya	5.47 ± 0.21	11.48 ± 0.45	0.70 ± 0.01
H4	Green	Libya	1.05 ± 0.02	6.53 ± 0.21	0.40 ± 0.01
H5	Green	Sudan	1.51 ± 0.05	0.40 ± 0.01	0.90 ± 0.04
H6	Green	Sudan	0.85 ± 0.02	0.29 ± 0.01	ND
H7	Black	Sudan	20.51 ± 1.00	4.60 ± 0.01	1.45 ±0.04
H8	Black	Sudan	21.02 ± 0.89	5.32 ± 0.18	0.47 ±0.02
H9	Black	Sudan	22.60 ± 0.83	1.44 ± 0.05	0.72 ± 0.02
H10	Green	Yemen	0.47 ± 0.01	11.55 ± 0.40	0.60 ± 0.02
H11	Black	Yemen	22.51 ± 0.98	6.47± 0.21	1.11 ± 0.04
H12	Black	Pakistan	24.76 ± 0.65	4.88 ± 0.06	0.55 ± 0.01
H13	Black	Pakistan	25.68 ± 0.59	7.34 ± 0.29	0.41 ± 0.01
H14	Black	India	27.23 ± 0.43	7.48 ± 0.32	0.71 ± 0.05
H15	Black	India	31.98 ± 0.93	11.32 ± 0.30	0.67 ± 0.01
Over all mean ± SD (n = 15)			15.13 ± 11.51	6.30 ± 3.59	0.68 ± 0.33

ND = Not detected (lower than the LOD for As of 0.008 µg·g⁻¹), SD = Standard deviation. SD = Standard deviation.