Table 7.

Percentage of recovery of IAEA-086 Human Hair according to digestion methods (%)

Element	Digestion Methods
	Wet Acid (HNO3)	Wet Acid (HNO3 & H2O2)	Dry Ash
Cu	144	141	82
Se	110*	85	5
Mn	195	110*	109*
Mg	157	97*	90
Zn	144	132	72

$\text{Percentage\hspace{0.17em}of\hspace{0.17em}Recovery}=\frac{\text{The\hspace{0.17em}Analysed\hspace{0.17em}Concentration\hspace{0.17em}of\hspace{0.17em}Reference\hspace{0.17em}Material}}{\text{The\hspace{0.17em}Certified\hspace{0.17em}Concentration\hspace{0.17em}of\hspace{0.17em}Reference\hspace{0.17em}Material}}\times 100$

^*Sample Shows Good Percentage of Recovery.