Breathing circuit cannisters containing functional CO2 absorbent are critical to prevent rebreathing CO2 during general anesthesia using closed or semiclosed breathing systems. Ethyl violet is the indicator dye added to Sodasorb to indicate impending exhaustion of the absorbent. A case of CO2 rebreathing due to failure of ethyl violet indicator in exhausted Sodasorb was encountered. Laboratory investigation demonstrated that dye failure could result from photodeactivation caused by fluorescent lights. Using a fixed intensity fluorescent light source and quantitative spectrophotometric analysis, a highly significant dose-response relationship was demonstrated between duration of light exposure and the decrease in ethyl violet concentration. After 24 h of fluorescent light exposure with a received flux density of 46 nwatts/cm2 at 254 nm, the concentration of functional ethyl violet remaining in pulverized Sodasorb was 16% of the baseline value. Furthermore, using multiple light sources of various intensities, the greater the intensity of light, the more rapid the rate of decline of the ethyl violet concentration. It is recommended to minimize the problem by using ultraviolet filters and incorporating additional ethyl violet in Sodasorb. Finally, ethyl violet undergoes temporal deactivation after a Sodasorb container is opened, even if it is stored in the dark.

中文翻译：

---

乙基紫的光灭活

含有功能性 CO2 吸收剂的呼吸回路罐对于在使用封闭或半封闭呼吸系统的全身麻醉期间防止重复吸入 CO2 至关重要。乙基紫是添加到 Sodasorb 中的指示剂染料，用于指示吸收剂即将耗尽。遇到了因用尽的 Sodasorb 中的乙基紫指示剂失效而导致 CO2 再吸入的案例。实验室调查表明，荧光灯引起的光失活可能导致染料失效。使用固定强度的荧光光源和定量分光光度分析，在光照持续时间和乙紫浓度降低之间证明了非常显着的剂量反应关系。在 254 nm 处接收到的通量密度为 46 nwatts/cm2 的荧光灯照射 24 小时后，残留在粉状 Sodasorb 中的功能性乙基紫的浓度为基线值的 16%。此外，使用不同强度的多个光源，光强度越大，乙基紫浓度下降的速度越快。建议通过使用紫外线过滤器并在 Sodasorb 中加入额外的乙基紫来最大程度地减少问题。最后，打开 Sodasorb 容器后，即使将其储存在黑暗中，乙基紫也会暂时失活。建议通过使用紫外线过滤器并在 Sodasorb 中加入额外的乙基紫来最大程度地减少问题。最后，打开 Sodasorb 容器后，即使将其储存在黑暗中，乙基紫也会暂时失活。建议通过使用紫外线过滤器并在 Sodasorb 中加入额外的乙基紫来最大限度地减少问题。最后，打开 Sodasorb 容器后，即使将其储存在黑暗中，乙基紫也会暂时失活。