A novel device for trapping gaseous compounds was invented and employed to create a user-friendly cyanide test kit for aqueous solutions. This specially designed device is housed in a small polypropylene straw with one end sealed. The device is packaged with chemicals to liberate, trap and quantify hydrogen cyanide gas. Piercing a pinhole near the bottom of the device and lowering it into the sample allows the sample to enter the device. When a sufficient amount of sample has entered the device, the device is sealed by wetting of cotton with propylene glycol inside the device. The hydrogen cyanide gas is generated by reacting the sample with sulfuric acid inside the device. The produced hydrogen cyanide is trapped by potassium hydroxide, and it is detected by the reaction between p-nitrobenzaldehyde and o-dinitrobenzene, using cyanide ions as a catalyst, to produce a purple compound of o-nitrophenyl hydroxylamine dianions. Within 10 minutes, this method provides a linear working range of 0.02–0.20 mg L⁻¹ CN⁻. The calibration line has a coefficient of determination of 0.99. Moreover, this device does not require any addition of chemicals by users, thus increasing its safety and ease of use. The developed device was applied to measure the concentration of cyanide in natural water, fresh bamboo shoots, and fruit juice.

中文翻译：

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用于氰化物检测和定量的无膜气体捕集装置

发明了一种用于捕集气态化合物的新型装置，并用于创建用于水溶液的用户友好型氰化物测试套件。这种经过特殊设计的设备装在一端密封的小型聚丙烯吸管中。该设备包装有化学物质，用于释放，捕集和定量氰化氢气体。在设备底部附近刺一个针孔并将其降低到样品中，可使样品进入设备。当有足够数量的样品进入设备后，通过用设备内部的丙二醇将棉花润湿将设备密封。通过使样品与设备内部的硫酸反应生成氰化氢气体。生成的氰化氢被氢氧化钾捕获，并通过对硝基苯甲醛与邻二硝基苯，使用氰化物离子作为催化剂，可生成邻硝基苯基羟胺二阴离子的紫色化合物。在10分钟内，该方法提供的0.02〜0.20毫克的L的线性工作范围^-1 CN ^- 。校准线的确定系数为0.99。而且，该设备不需要用户添加任何化学药品，因此增加了其安全性和易用性。研发的装置用于测量天然水，鲜笋和果汁中氰化物的浓度。