Aparecida Nicoletti M, Fernandes Magalhäes J
Universidad de São Paulo, Facultad de Ciencias Parmacéuticas, Departamento de Farmacia, Brasil.
Bol Oficina Sanit Panam. 1996 Oct;121(4):301-9.
This study was performed to analyze the chemical stability of sodium hypochlorite (with 2.6% or 26.0 mg/mL of free residual chlorine) in the various types of containers when exposed to different light levels. Over a period of eight months, several samples of that solution were put into containers made of glass (amber or clear) and plastic (opaque white, opaque green, or clear) with and without a top, and were exposed to three different lighting conditions (continuous light, total dark, and ambient light of the laboratory where the study was carried out). The stability of the solution was analyzed by measuring the concentration of free residual chlorine in the samples exposed as described above. The environmental factors tested were chosen as representative of the various conditions under which this effective, cheap, and widely available household disinfectant is often stored and used by the general public. The results indicated that chemical instability increased with the presence of light, the absence of a top, and the length of time the solution was stored. The most suitable containers were those made of amber glass, opaque green plastic, or opaque white plastic, although the last one offered the least protection of the three.
本研究旨在分析次氯酸钠（游离余氯含量为2.6%或26.0毫克/毫升）在暴露于不同光照水平时，置于各类容器中的化学稳定性。在八个月的时间里，将该溶液的多个样本分别放入有盖和无盖的玻璃容器（琥珀色或透明）以及塑料容器（不透明白色、不透明绿色或透明）中，并使其暴露于三种不同的光照条件下（持续光照、完全黑暗以及进行该研究的实验室的环境光）。通过测量上述暴露样本中的游离余氯浓度来分析溶液的稳定性。所测试的环境因素被选为代表各种条件，在这些条件下，这种有效、廉价且广泛可得的家用消毒剂常被公众储存和使用。结果表明，化学不稳定性会随着光照的存在、无盖以及溶液储存时间的延长而增加。最合适的容器是由琥珀色玻璃、不透明绿色塑料或不透明白色塑料制成的容器，不过最后一种在这三种中提供的保护最少。
