Anodic Stripping Voltammetry Heavy Metal Analyzer

What is the Anodic Stripping Voltammetry Heavy Metal Analyzer?

An electrochemical analyzer that preconcentrates metals on a working electrode and measures stripping peaks for lead, cadmium, copper and zinc at 0.1 to 1000 µg/L. It provides a low-cost, compact alternative to atomic spectroscopy for screening water and wastewater.

Overview

This variant uses a three-electrode cell comprising a working electrode such as glassy carbon with bismuth or gold film, an Ag/AgCl reference and a platinum counter electrode. After deposition at about −1.2 V for 60–300 seconds, a square-wave or differential pulse sweep re-oxidizes the metals, producing peaks for zinc, cadmium, lead and copper at characteristic potentials. Standard addition calibration compensates for matrix effects, and software integrates peaks automatically. Detection limits are typically 0.1–1 µg/L for lead and cadmium, with relative standard deviation below 5%. Samples are acidified to pH 1–2 and often UV digested when organics are present. The analyzer can handle drinking water, surface water and moderately clean effluents, and it requires no gases. The measurement takes 5 to 10 minutes per sample, limiting throughput, and interferences from high organics, surfactants or intermetallic compounds need attention.

How does it work?

Heavy metal analyzers rely on electrochemical or atomic spectroscopic principles. In anodic stripping voltammetry (ASV), metals are first deposited onto a working electrode at a negative potential, then re-oxidized by a potential sweep, and the stripping current peak at a characteristic potential is proportional to concentration. In atomic absorption spectrometry (AAS), a sample is atomized in a flame or graphite furnace and a hollow cathode lamp beam is absorbed at the metal's wavelength according to Beer–Lambert law. Atomic fluorescence spectrometry (AFS) generates mercury or arsenic hydrides by reaction with borohydride, excites the atoms with a lamp and detects the emitted fluorescence at right angles. Calibration with certified standards, matrix modification and blank correction yield concentrations in µg/L.

What are the key features?

• Three-electrode cell with bismuth or gold film working electrode
• Square-wave and differential pulse stripping modes with automatic peak integration
• Simultaneous detection of zinc, cadmium, lead and copper in one scan
• Standard addition calibration built into the software
• No compressed gases required, low power consumption
• Optional UV digestion accessory and autosampler for batch work

What are the technical specifications?

A typical anodic stripping voltammetry heavy metal analyzer configuration offers measuring method of Anodic stripping voltammetry (SWASV / DPASV), analytes of Zn, Cd, Pb, Cu (Hg, As optional), measuring range of 0.1–1000 µg/L, detection limit (Pb, Cd) of 0.1–1 µg/L, repeatability of RSD ≤ 5% and deposition time of 30–600 s (programmable). Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Anodic Stripping Voltammetry Heavy Metal Analyzer is used in screening lead and cadmium in drinking water, copper and zinc monitoring in electroplating rinse water, groundwater screening surveys and teaching electrochemistry laboratories. Across the wider Heavy Metal Analyzers class, laboratories also deploy it for drinking water lead, cadmium and arsenic compliance, industrial wastewater discharge metal monitoring and mercury and arsenic determination in surface water.

Which standards and certifications apply?

Relevant standards and methods include ISO 15586, ISO 17294-2, ISO 11885, ISO 17852, ISO 11969, HJ 694, HJ 700, GB/T 5750.6, ASTM D3559 and IEC 61010-1. Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Trace metal work starts with contamination control: use acid-washed plastic containers, high-purity nitric acid and ultrapure water, and preserve samples to pH below 2. Digest samples containing particulates or organics according to the method before analysis. Calibrate with a blank and at least three standards and verify with independent check standards, spikes and duplicates each batch. AAS and AFS need compressed gases, exhaust ventilation and lamp warm-up, and mercury methods need gold-trap or cold-vapor handling. Electrodes for ASV need polishing or replacement of mercury-free film. Handle acid, mercury and arsenic waste under local hazardous waste rules. Use instruments in rooms with stable temperature and follow IEC 61010-1 safety requirements.

How do I select the right Anodic Stripping Voltammetry Heavy Metal Analyzer?

Choose the ASV analyzer for affordable screening of lead, cadmium, copper and zinc, or where gases and laboratory infrastructure are limited. For mercury, arsenic or regulatory compliance, use AFS or AAS. In an RFQ, specify target metals, detection limits, sample matrices, electrode type, autosampler need and any reference method the results must match.

How does it compare with other Heavy Metal Analyzers variants?

Match the technique to the metals, detection limits and workload. For lead, cadmium, copper and zinc screening at low cost, stripping voltammetry offers µg/L sensitivity and portability. Mercury, arsenic, selenium and antimony at sub-µg/L are best served by atomic fluorescence with hydride generation. Flame AAS handles mg/L to high µg/L levels of common metals such as copper, zinc, iron and chromium quickly and economically. Graphite furnace AAS reaches sub-µg/L for cadmium, lead and chromium with tiny sample volumes but at lower throughput. If you must analyze many elements simultaneously at ng/L levels, ICP-MS is a different class of instrument. Consider the regulatory limit, sample numbers, digestion needs, gases required, operator skill and whether results must follow a named method such as HJ 694 or ISO 15586.