利用一种新型会聚流纸光传感装置在线气体净化测定水样中总氨氮

IF 5.2 Q1 CHEMISTRY, ANALYTICAL Advances in Sample Preparation Pub Date : 2023-08-01 DOI:10.1016/j.sampre.2023.100076
Ali Sahragard , Waleed Alahmad , Thidarat Samkumpim , Manuel Miró , Pakorn Varanusupakul
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引用次数: 0

摘要

建立了一种新型、廉价、灵敏的测定水中总氨氮的微量分析系统。该系统设计用于使用在线吹扫系统检测氨,该系统与新设计的气体会聚流动池相结合,采用在线纸基比色检测。气体会聚流动池用作气室、纸基设备支架和颜色检测池。纸基装置用蝴蝶豌豆提取物(一种天然酸碱指示剂)浸渍,其颜色会根据产生的氨气而变化。对天然指示剂浓度、吹扫时间等分析参数进行了研究和优化。彩色图像可以由集成内窥镜相机或智能手机拍摄,并由ImageJ软件以RGB模式进行分析。在最佳条件下,观察到两个线性动态范围。通过在Milli-Q水中使用1:2(v/v)稀释的2%(w/v)蝴蝶豌豆提取物,实现了0.05–0.9 mg L−1的低线性浓度范围,检测限(LOD)为0.02 mg L−,定量限(LOQ)为0.05 mg L−。通过使用未稀释的2%(w/v)蝴蝶豌豆提取物,获得了0.5–4 mg L−1的高线性浓度范围,LOD为0.1 mg L−2,LOQ为0.3 mg L−3。最后,利用优化后的方法测定了对虾养殖过程中不同水样中的氨氮。
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In-line gas purging exploiting a novel converging flow-on paper optosensing device for the determination of total ammonia-nitrogen in water samples

A novel, inexpensive, and sensitive microanalytical system for the determination of total ammonia-nitrogen (ammonia-N) in water was developed. The system was designed to detect ammonia using an in-line purging system coupled with a newly designed gas converging flow cell incorporating in-line paper-based colorimetric detection. The gas converging flow cell served as a gas chamber, a paper-based device holder, and a color detection cell. The paper-based device was impregnated with butterfly pea extract (a natural acid-base indicator), the color of which changed on the basis of the generated ammonia gas. Analytical parameters such as concentration of natural indicator and purging time were studied and optimized. The color image could be captured by an integrated endoscope camera or smartphone and analyzed by ImageJ software in RGB mode. Under optimal conditions, two linear dynamic ranges were observed. By using 1:2 (v/v) diluted 2% (w/v) butterfly pea extract in Milli-Q water, a low linear concentration range of 0.05–0.9 mg L−1 with a limit of detection (LOD) of 0.02 mg L−1 and limit of quantification (LOQ) of 0.05 mg L−1 was achieved. By using a non-diluted 2% (w/v) butterfly pea extract, a high linear concentration range of 0.5–4 mg L−1 with an LOD of 0.1 mg L−1 and LOQ of 0.3 mg L−1 was obtained. Finally, the optimized method was leveraged to determine ammonia-N in various water samples from shrimp farming.

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