(来学网)当空气中铅用双硫腙比色法测定时,溶液中PH应在什么范围
  • A.
    (来学网)pH8.5~11.0
  • B.
    (来学网)pH2.5~4.0
  • C.
    (来学网)pH4.5~6.0
  • D.
    (来学网)pH5.0~6.5
  • E.
    (来学网)pH7.0~8.5