Arsenic contents in hair and nail were increased , and the peak content of arsenic could reach 2 . 5 to 2 . 7 microg/g tissue at CR .
arsenic contents in hair and nail were increased , and the peak content of arsenic could reach 2 . 5 to 2 . 7 microg/g tissue at cr .
O O O O O O O O O O O O O O B-other_organic_compound O O O O O O O O O O O O B-other_name O