PH Ntawv

1. Nqa cov ntawv xeem mus rau hauv cov cawv ua kom zoo rau ib nrab xyoo tom qab, tom qab ntawd coj nws tawm thiab piv nrog cov xim zoo nkauj txheem, uas yog PH tus nqi 2. Daim ntawv xeem no yog mot siv rau cov dej cawv thiab cov kua qaub lossis alkali cawv. tias qhov kev kub siab nyob hauv qab 0.01% 3. Daim ntawv kuaj no xav kom khaws cia rau hauv qhov chaw ntxoov ntxoo thiab qhuav. Preservation lub sijhawm yog 3 xyoos.