ECD's CA6 Colorimetric Analyzer Provides Precise and Dependable Measurement Data

  • April 28, 2021
ECD's CA6 Colorimetric Analyzer Provides Precise and Dependable Measurement Data
ECD's CA6 Colorimetric Analyzer Provides Precise and Dependable Measurement Data

April 27, 2021 - The federal, state and local managers and engineers responsible for the quality of municipal drinking water supplies who have been increasingly concerned about chromium VI levels for nearly two decades will find the  CA6 Colorimetric Analyzer from Electro-Chemical Devices provides them with precise and dependable measurement data to ensure detection, remediation and regulatory compliance.

Chromium, according to the U.S. Environmental Protection Agency (EPA), is an odorless and tasteless metallic element that is found naturally in rocks, plants, soil and volcanic dust, and animals. The most common forms of chromium that occur naturally in water are trivalent chromium (chromium III) and low-level hexavalent chromium VI.

According to the U.S. Occupational Health & Safety Administration (OSHA), high levels of chromium VI exposure in the workplace must be limited because of its potential cancer risk. In addition, chromium VI targets the respiratory system, kidneys, liver, skin and eyes. Specific exposure limits for chromium VI have been set by OSHA to protect workers.

To help remediate the industrial pollution and human health risks of chromium VI, ECD developed the Model CA6 Colorimetric Analyzer, which is an on-line sequential sampling continuous water measurement instrument. This analyzer is designed specifically to monitor chromium VI in plant effluent and drinking water. It can be configured to measure chromium VI in three separate ranges: 0 to 1.0 mg/L, 0 to 10.0 mg/L or 0 to 50.0 mg/L

The CA6 Colorimetric Analyzer’s sequence of sampling, analysis and results processing is performed and repeated using colorimetric methods for high accuracy and reliability. This technology relies on an LED light source and a heated colorimetric cell designed for measuring trace amounts of manganese, iron and other analytes in water.

The CA6 Analyzer is an effective solution to monitor treated industrial plant wastewater effluent prior to release.  In industry, chromium metal is added to alloy steel to increase hardenability and corrosion resistance. A major source of worker exposure to chromium VI occurs during "hot work" such as welding on stainless steel and other alloy steels containing chromium metal. Various chromium Vi-based compounds are also used as pigments in dyes, paints, inks, plastics, surface coating and electroplating.

ECD’s CA6 precision online sequential sampling analyzer is lightweight and easy to install. Weighing less than 40 pounds, it can be wall mounted or simply set on a bench using the optional bench top stand. After the sample, waste and reagent lines have been connected to the analyzer and provided with power, the CA6 will begin its preprogrammed analysis sequence. The CA6 is available with up to four channels (optional) each from a separate sample point. A simple, user-friendly menu structure and touchscreen interface makes it easy to access information or customize analyses. 

The CA6 utilizes photometric differential absorbance to analyze chromium VI and over 20 other common parameters including: aluminum, iron, manganese, silica, nitrogen, iron and sulfate. It operates over a wide temperature range of 5-50°C and  offers repeatability of ±2% on the absorbance value if the turbidity <80 NTU and drift of ±2% per month on the absorbance measurement.

The CA6 Analyzer’s easy-to-use touch-screen display shows the measured parameter, analyzer status, percent reagent volumes and the menu bar, which provides access to the run, display, program, service and help menus. It includes two alarm relay outputs and a 4-20 mA channel that connects with programmable logic controllers (PLC’s) or distributed control systems (DCS’s).

The rugged and reliable CA6 features two separate compartments to isolate liquids and electronics and is enclosed in an epoxy powder coated, cold rolled steel cabinet. The liquids enclosure houses all the components necessary for sampling and reagent flow, mixing and reaction stages (sampling pump, reagent micro-pumps and colorimetric reaction cell).