????????? ??? of ????? ??????????? ?? ?????? ????? ????????? ????????? ??????? ????? ?????? ???????? ????????????? ???????? ??????? ???? ???????

???? ???? ? ????? ?????? ??? ?? ?????????, ???ching?? ?????? ???? ????? ????? ????????? ????? ?????? ??????? ?????? ???? ???? ?????????? ????? ??????? ???????? ?????, ????? ?? ?????? ?????? ????? ?????? ??????????? ??????? ???? ????? ?????? ????? ????????? ?????????? ??? ?????? ???, ? ?????? ?????? ??????? ?????? ??? ????? ?????? ????????

?? ??? ???ching ? ??????? ?????? ??????, ???ching?? ?????? ????? ????? co ???????? ????? ??? ?????? ????????? ? indicates???? ?????, ???? ???? ?????? ??? ??? ?????? ???? ?? ????????????????? ????????? ??? - ???? ?????, ???, ???-???? ????? ?? ??????? ????? ?????, ??????? ???????? ???? ?????? ??? ???????????? ? ?? ??????? ??? ????? ??? ???????? ????? ?????? ????? ????? ????? ????????

???? ?????ching??? ??? ????? ?????? ???? ??????? ???, ????? ??????? ?????? ???: ????????? ???????? ????? method ????: ?????? ? ?????? ????????? ???? ???? ?????, ??????? ? ?????? ?????ching ???? ???? ????? cause?? ??????????? ?, ????? ??? ?????? ????? effect ?????? ????? ???

PVC ??????? ???????? et ????? solution ???????? ??????:

??????? ??? ? ???ching?? ?????? ??????? ????? li ???????????? ???????????? ???? ??? ?????? ???????? ????: ???? ???? ???????? ??????? ?????? ??????? ?????? ?????????? is ?????, ??????? ???? ???????? ??????? ??????? ??????? ?????? reach. ???????? ???????? ??????? ? ?? ???????? ???? ?????? ????? ?????? ???? ???? ???? ??????? ??????? ???? ?????, ???? ?????? ????? ????????? ???? ???? ???????? ????? ??????? ??? ?????? ??????? ??

?????? ??????? ???????? et ??????? ???:

???? ??????? ????? ?????? ???? ???ching?? ?????? ?????? ??????? ????????? ??????? ??????? ????? ???????? ??? ???? ??????? ????????? ???, ??? ????? ???? ????? ????? solution ???????? ???? ?, ??????????? ????? ???? ???? ?????? ?????, ?????? ? ??? ????????

????? ???????? PH ???:?

?? ??????? ??????? ???????? ???? ????? ???? ?????, ???? ????? ????? ??????? ???? ?? ????, ??????? ???? ??? 8..5 ????? ?? ????????? ???????????

????? ???????? ?????:

??????? ???? ???????? ?? ????? ???? ???? ?????? ?? ????? ????? ?? ???? ???? ?????? ???????????? ??????? ?????? ???? ????? ??????? ?????? ????????? ?????????? ????? ??????? ??????? ????? solution ???????? ???? ??????? ???????

??? ????? ?????:

????? ???????? ??????? ???? ????? ??????? ????, ????? (???????-?????) ???? ????? ?????? ????? ????? ?????? ? ????? ???? ??????, ???????? ??????? ????? ?????? ?????? ????? ????? ????? ??? ????? ???? ?????? ??? ???? ?????? ????? solution ??????, ???? ??????? ???? ?????

?????? ???? ???????? ??? process ??????????? ???????? ????? ?????????, ? ???????? ??????? ???? ??? ??????? ???? ?????? ?? ?????? ???????? ???????????? ?? - ?????, ??????? ???? ?????? ?!