Ki fonksyon prensipal solisyon tanpon pH pou yon mèt pH?
⑴ Kalibrasyon mèt pH anvan mezi pH
Pou verifye presizyon nan yon mèt pH, pou egzanp, apre yo fin kalibre pH mèt la ak pH 6.86 ak pH 4.00, mete elektwòd pH la nan solisyon an pH 9.18 epi tcheke si valè ekspozisyon enstriman an ki konsistan avèk valè pH solisyon estanda a;
⑶ Tcheke si mèt pH la bezwen rekalibre pandan mezi presizyon jeneral. Apre kalibrasyon ak lè l sèvi avèk pH mèt la, flote oswa chanjman ka rive. Se poutèt sa, anvan tès la, mete elektwòd la nan yon solisyon tanpon estanda ki toupre solisyon an mezire, epi detèmine si rekalibrasyon nesesè ki baze sou grandè erè a.
⑷ Tès pèfòmans elektwòd pH
Ki jan yo prepare solisyon tanpon estanda pH?
Pou mezi jeneral pH, yo ka itilize yon seri konplè reyaktif tanpon pH (250ml ka prepare). Lè w ap prepare solisyon an, yo ta dwe itilize dlo deyonize epi bouyi pou 15-30 minit davans pou retire gaz kabonik ki fonn. Koupe ouvri sak plastik la epi vide reyaktif la nan yon beaker. Fonn li nan yon kantite ki apwopriye nan dlo deyonize, rense sak anbalaj la, epi vide l nan yon flakon volumétrique 250ml. Delye nan mak la epi souke byen.
Ki jan yo byen estoke epi sèvi ak solisyon tanpon pH;
After preparing the buffer solution, it should be placed in a glass bottle or a polyethylene bottle (alkaline pH buffer solutions such as pH9.18, pH10.01, pH12.46, etc. should be placed in polyethylene bottles). The bottle cap should be tightly closed and stored at low temperature (5-10 ℃) in the refrigerator. Generally, it can be used for about two months. If turbidity, mold or precipitation are found, it cannot be continued to be used. When using, prepare several 50ml polyethylene small bottles, pour the buffer solution from the large bottles into the small bottles, and let them stand at ambient temperature for 1-2 hours until the temperature is balanced before use. After use, it should not be poured back into the large bottle to avoid contamination. The buffer solution in the small bottle can be used for 2-3 days under environmental conditions of>10 degre. Anjeneral, solisyon pH 7.00, pH 6.86 ak pH 4.00 ka itilize pou peryòd tan ki pi long. Valè pH pH 9.18 ak pH 10.01 solisyon yo relativman fasil pou chanje akòz absòpsyon CO2 nan lè a.
