Fabian T M, Walker S E
Am J Hosp Pharm. 1982 Jun;39(6):1016-7.
The stability of diluted solutions of sodium hypochlorite was studied. Sodium hypochlorite 1% solutions were diluted (1:8, 1:12, and 1:20) and stored at room temperature in a window exposed to sunlight in amber-glass, two-liter bottles that were two-thirds full. Samples were taken 25 times throughout a six-month study period; bottles were opened only on sampling days. An iodometric titration was used to determine the percent available chlorine in each sample. Least-squares regression analyses of the percent available chlorine yielded lines with negative slopes for each dilution (-7.7 X 10(-6), -8.1 X 10(-6), and -1.5 X 10(-6) for the 1:8, 1:12, and 1:20 dilutions, respectively). Using the fastest degradation rate (from the 1:12 dilution), 5.24% of available chlorine would be lost per year. The concentration of sodium hypochlorite would therefore remain above 90% of the initial concentration for 22.9 months. It is concluded that sodium hypochlorite solution stored in amber-glass bottles should carry a 23-month expiry date on chemical stability.
对次氯酸钠稀释溶液的稳定性进行了研究。将1%的次氯酸钠溶液进行稀释（1:8、1:12和1:20），并在室温下保存在装满三分之二溶液的两升琥珀色玻璃瓶中，放置在有阳光照射的窗边。在为期六个月的研究期间共取样25次；瓶子仅在取样日打开。采用碘量滴定法测定每个样品中的有效氯百分比。对有效氯百分比进行的最小二乘回归分析得出，每种稀释度的斜率均为负（1:8、1:12和1:20稀释度的斜率分别为-7.7×10⁻⁶、-8.1×10⁻⁶和-1.5×10⁻⁶）。以最快的降解速率（来自1:12稀释度）计算，每年有效氯损失5.24%。因此，次氯酸钠的浓度在22.9个月内将保持在初始浓度的90%以上。得出结论，储存在琥珀色玻璃瓶中的次氯酸钠溶液在化学稳定性方面的有效期应为23个月。
