Water Arsenic Detector

I. Product Overview

The water arsenic analyser is an intelligent total arsenic analyser developed on the principle of spectrophotometry, specially intended for the rapid quantitative determination of total arsenic in drinking water, surface water, groundwater and wastewater. A high-performance LED light source and a large-area photocell are combined with an optimised silver nitrate–polyvinyl alcohol absorption and colour-development system, ensuring high sensitivity and stability at 420 nm. The Android smart operating system makes operation intuitive and smooth, while 8-million-record storage, Wi-Fi/Bluetooth transmission and a water-resistant housing make the instrument ideal for both laboratory and field testing. Multi-point calibration and stored curves, together with Type-C charging and long battery life, provide an accurate, convenient and reliable integrated arsenic testing solution.

II. Measuring Principle

The instrument is designed on the basis of 《Water quality — Determination of total arsenic — Silver diethyl dithiocarbamate spectrophotometric method》(GB 7485-87) and 《Water quality — Determination of trace arsenic — Potassium borohydride–silver nitrate spectrophotometric method》(GB 11900-89).
Under acidic conditions zinc granules react to produce nascent hydrogen, which reduces arsenic in the sample to arsine gas. The gas is led into a silver nitrate–polyvinyl alcohol–ethanol absorbing solution to form stable yellow colloidal silver. The absorbance of the coloured product at 420 nm is proportional to the arsenic concentration. The built-in high-precision optical system measures the absorbance automatically and calculates the arsenic concentration directly from the pre-calibrated curve. The method is simple to operate and highly sensitive, and is suitable for the rapid, accurate determination of trace arsenic in all types of water.

III. Applications

The instrument is intended for the quantitative determination of total arsenic in all kinds of water bodies, covering a measuring range from 0.01 mg/L to 0.50 mg/L. It is suitable for baseline surveys and routine monitoring of surface water and groundwater in environmental monitoring, and is a reliable tool for water supply authorities screening drinking water sources, treated water and network terminal water for arsenic. It can also be used for compliance testing of industrial wastewater and domestic sewage outfalls (complex samples require standard digestion pre-treatment). In addition it supports agricultural irrigation water assessment, batch analysis in third-party testing laboratories, research projects and rapid on-site screening in emergency pollution incidents.

IV. Key Features

1. Android 7.1.1 smart operating system with a user-friendly Chinese interface for faster response and greater stability.

2. 8-inch LCD touch screen with intuitive, simple readout.

3. Precision colorimetric cell design with a consistent light source, eliminating errors caused by light source variation and improving accuracy.

4. Imported ultra-bright LED light source with automatic brightness adjustment and calibration.

5. Wireless communication via Wi-Fi, RJ45 and mobile hotspot; data can also be exported through a USB drive.

6. Multi-functional sample management with Chinese/English sample naming for convenient recording and storage.

7. 8 million data sets can be stored permanently; records can be searched by time and selected for analysis.

8. Built-in regulatory cloud platform: data can be uploaded over a LAN or the Internet and interfaced with the platform of the environmental supervision authority.

9. Built-in thermal line printer with freely selectable print content, including QR codes.

10. Optional 6 Ah high-capacity rechargeable lithium battery for field testing.

11. Built-in instructional videos let users watch the procedure while operating the instrument.

12. Firmware can be upgraded later.

V. Technical Parameters

Performance parameters

Physical parameters

Operating environment