Ki sa ki se yon solisyon tanpon pH estanda? Ki pwopriyete li yo?
Yon solisyon tanpon pH se yon solisyon ki kenbe valè pH la estab. Si yo ajoute yon ti kantite asid oswa alkali nan solisyon sa a, oswa yon reyaksyon chimik nan solisyon an pwodui yon ti kantite asid oswa alkali, epi solisyon an se yon fason ki apwopriye dilye, valè pH solisyon an se fondamantalman ki estab, ki ka reziste. yon ti kantite asid. Yon solisyon ki gen valè pH pa chanje lè baz la gwo oswa dilye yo rele yon solisyon tanpon.
Tanpon estanda pH gen karakteristik sa yo:
(1) Valè pH solisyon estanda a konnen epi li rive nan presizyon espesifye a;
(2) Valè pH solisyon estanda a gen bon repwodiksyon ak estabilite, gen yon gwo kapasite tanpon, yon ti valè dilution ak yon ti koyefisyan tanperati;
(3) Metòd preparasyon solisyon an senp;
2. Ki jan yo prepare solisyon tanpon estanda pH?
Pou mezi pH jeneral, yo ka itilize yon seri konplè reyaktif gwoup pH (250 mL ka prepare). Lè w ap prepare solisyon an, yo ta dwe itilize dlo deyonize epi bouyi pou 15 a 30 minit davans pou retire gaz kabonik ki fonn. Koupe sache plastik la epi vide reyaktif la nan yon gode, fonn li ak yon kantite dlo deyonize ki apwopriye, rense sak la, apresa vide l nan yon flakon volumetrik 250mL, delye nan mak la, epi souke byen.
3. Ki jan yo byen estoke epi sèvi ak solisyon tanpon pH?
After the buffer solution is prepared, it should be placed in a glass bottle or polyethylene bottle (alkaline pH buffer solutions, such as pH=9.18, pH=10.01, pH=12.46, etc., should be placed in polyethylene bottles) with the bottle cap tightly closed. , stored in the refrigerator at low temperature (5-10℃), it can generally be used for about six months. If the mixer is found to be turbid, moldy or precipitated, it cannot be used further. When using, several 50mL polyethylene vials should be prepared, pour the combined solution in the large bottles into the vials, and leave them at ambient temperature for 1 to 2 hours, and wait for the temperature to balance before use. Do not pour it into a large bottle after use to avoid contamination. The buffer solution in the bottle can be used for 2 to 3 days under environmental conditions >10 degre. Anjeneral, twa solisyon pH=7.00, pH=6.86, ak pH=14.00 yo ka itilize kòm lontan ke Pou yon tan ki pi long, valè pH pH=9.18 ak pH=10.01 solisyon pi fasil pou chanje akòz absòpsyon gaz kabonik nan lè a.
