A cost-effective, automated and portable IC has been developed for in-situ analysis of nitrite and nitrate in natural waters. The system employed 3D printed pumps for eluent delivery and a deep-UV LED based optical detector. Isocratic separation and selective detection of nitrite and nitrate was achieved in under 3 min. The total weight of the analyser was ∼11 kg, and included electronics along with a sample intake system for automated analysis. Linear calibration ranges were generated using different sample injection loops. Using a 150 μL loop, an analytical range (0.05–30 mg L⁻¹ NO₂⁻, 0.10–75 mg L⁻¹ NO₃⁻) suitable for freshwater analysis was generated, while using a 10 μL loop an analytical range (0.30–100 mg L⁻¹ NO₂⁻, 2.5–500 mg L⁻¹ NO₃⁻) suitable for effluent and domestic wastewater analysis was achieved. Chromatographic repeatability demonstrated by the system is graphically presented and RSD values of <4% were obtained in terms of peak area and retention time over 82 sequential runs. The system was deployed in-situ at multiple sites for varying deployment periods analysing septic tank water, effluent from a waste water treatment plant and stream water. The data generated by the in-situ system were comparable to grab sample data generated by accredited laboratory instrumentation.

已经开发出了一种经济高效的自动化便携式IC，用于对天然水中的亚硝酸盐和硝酸盐进行现场分析。该系统采用3D打印泵进行淋洗液输送，并使用基于深紫外LED的光学检测器。在3分钟内完成了等度分离以及亚硝酸盐和硝酸盐的选择性检测。分析仪的总重量约为11千克，包括电子设备以及用于自动分析的进样系统。线性校准范围是使用不同的进样环产生的。使用150μL定量环，分析范围为（0.05–30 mg L ^-1 NO ₂ ⁻，0.10–75 mg L ^-1 NO ₃ ⁻）在适合于淡水分析产生，而使用10微升环的分析范围（0.30-100毫克的L ^-1 NO ₂ ^-，2.5-500毫克的L ^-1 NO ₃ ^{- ），}适用于污水和生活废水分析来实现的。系统显示的色谱图可重复性以图形方式显示，在82次连续运行中，峰面积和保留时间方面RSD值<4％。该系统在多个地点现场部署，用于不同的部署期，分析化粪池水，废水处理厂的废水和溪流水。原位生成的数据 该系统可与通过认可的实验室仪器生成的样本数据进行比较。