供应美国标准局NIST粉末状PH校准用标准物质
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These SRMs are used to prepare solutions of known hydrogen ion activity to calibrate commercial pH instruments. SRMs 186g and 191d are each certified for use as an admixture only. SRM 186g (186-I-g and 186-II-g) may be used to prepare solutions with a pH of 6. 8640 at 25°C, or physiological buffer solutions with a pH of 7.4157 at 25°C./ 这些SRM用于制备已知氢离子活性的溶液，以校准商用pH仪器。SRM 186g和191d均经认证仅作为外加剂使用。SRM 186g（186-I-g和186-II-g）可用于制备25℃时pH值为6.8640的溶液，或25℃时pH值为7.4157的生理缓冲溶液。
SRM 185i Potassium Hydrogen Phthalate, pH Standard 邻苯二甲酸氢钾，pH标准 60 g
SRM 186g Potassium Dihydrogen Phosphate (186-I-g) Disodium Hydrogen Phosphate (186-II-g) 磷酸二氢钾（186-I-g）磷酸氢二钠（186-II-g） set
SRM 187f Sodium Tetraborate Decahydrate (Borax) pH Standard 十水合四硼酸钠（硼砂）pH标准 30 g
SRM 188 Potassium Hydrogen Tartrate (pH Standard) 酒石酸氢钾（pH标准） 60 g
SRM 189c Potassium Tetroxalate Dihydrate pH Standard 二水四氧化二钾pH标准 65 g 美国标准局NIST粉末状PH校准用标准物质
SRM 191d Sodium Bicarbonate (191d-I)Sodium Carbonate (191d-II) 碳酸氢钠（191d-I）碳酸钠（191d-II） 1 bottle x25g;1bottlex30g
SRM 2193b Calcium Carbonate pH Standard (used as saturated calcium hydroxide solution) (pH Standard) 碳酸钙pH标准（用作饱和氢氧化钙溶液）（pH标准） 30 g