磷酸缓冲液缓冲效果不理想?求助!本人最近通过氧化亚硫酸钠法测定氧传递,试剂参照相关文献配制,The sulfite solution system contained 0.5 M sodium sulfite, 10?7M cobalt sulfate, 0.012 M Na2HPO4/NaH2PO4phosphate buffer (pH 8.0) and 2.4 × 10?5M bromo-thymol blue. The initial pH was adjusted to 8.0 using 2.0 M sulfuric acid. The pH of the sulfite solution remained at an almost constant value of pH 8.0 before dropping sharply to avalue of pH 5.0 at the end of the reaction 但实际进操作时,反应一开始,pH就以每小时0.2个单位降低,而不是文献中所说的线保持不变后再突降。希望大家不吝赐教,十分感激。PS: 磷酸盐缓冲液 是自己计算配制的,称4g 十二水磷酸氢二钠 和0.1264g 二水磷酸二氢钠 ,定容至1L查看更多5个回答 . 20人已关注