PH / orp meter standard buffer preparation and preservation ⒈pH standard materials should be stored in a dry place, it will happen as deliquescence mixed phosphate pH standard material humidity in the air, once deliquescence ph meter, pH standard substance appears that Do not use. ⒉ preparation of pH using a secondary standard solution should be distilled or deionized water. If it is used for measuring pH 0.1, you can use an ordinary distilled water. ⒊ preparation of pH standard solutions should be used to dilute a small beaker industrial ph meter, to reduce the dip in the walls of the beaker pH standard solution. PH standard substance stored in plastic bags or other containers, in addition to be clean down outside, further washed several times with distilled water, then the pH of the standard solution was poured into ph meter wholesale formulated in order to ensure accurate pH standard solution prepared. ⒋ preparation of a good standard buffer solution can be stored for 2-3 months in general, if there is muddy, moldy or when precipitation and other phenomena, can not continue to use. ⒌ standard alkaline solution should be packed in polyethylene bottles sealed. Prevent carbonate formation after carbon dioxide entering the standard solution, lowering its pH. 13. Why is a buffer in the period, has gone can not be used? Validity refers to the buffer shelf unopened use state. Once opened use, due to the various roles of mold in the air easier deterioration. Recommendation: buffer after opening, refrigerate 14. Why save the measurement time up to 3 minutes or longer reasons: (1) the sample is ion-deficient (2) electrode aging improvements: (1) use Inlab420 / LE420 electrode (2) activation or replaced with new electrode 15. 3M KCl / AgCl solution with 3M KCl solution, what is the difference 3M KCl / AgCl KCl solution is saturated with AgCl. Since the reference electrode pH electrode consists of Ag / AgCl, exist in solution with the following balance: AgCl Ag ++ Cl- increased Cl- solution and Ag + ph meter principle, can shift the equilibrium to the left, to prevent the dissolution of AgCl, which play protective effects than the reference electrode. When the sample measurement contained S2-, Council and the Ag + reacts Ag2S precipitation, leaving the junction is blocked, so when measured solution containing S2-, to use free of AgCl KCl solution. ph meter price | Yinchuan ph meter | hundred to one hundred technology provided by Changzhou Technology Limited. Changzhou Best Technology Limited (www.czbckj.com) strong, credible, in Changzhou, Jiangsu chemical instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead one hundred innovative ideas into technology and you hand into the brilliant, for a better future!