Washing of Hair Samples
The hair samples were cut into pieces so as to ensure
feasible and fast digestion of the samples. Hair samples were
pre-washed with nonionic detergent and soaked in deionized
water for 10 minute. It was followed by soaking in acetone to
remove external contamination and finally the hair samples
were washed with deionized water. The samples were dried
in an oven at 110 ℃ for 1 hour and finally kept in a
desiccators pending analysis.