WATER / WASTEWATER 17 Colorimetric water analysis: Proven, Practical, Precise
As water-based industries continue to expand and evolve, the need for water analysis grows with them. New regulations and market dynamics shift the testing needs to lower cost, more precise readings, and faster reporting. Companies look to high-tech advancements like smart meters and on-line analysers for efficiency and accuracy but continue to rely on proven colorimetric methods to meet their testing needs. Colorimetry is the use of coloured compounds to determine the concentration of a target chemical compound. It is one of the earliest and most reliable forms of water analysis and is used to test for a wide array of analytes. The target analyte causes the sample solution to change color proportionally to its concentration in the solution, and that change in color can be measured visually or instrumentally. Traditionally, laboratories stocked the individual chemical components and analysts prepared reagents in bulk from scratch. Often excess expired reagent had to be disposed. Test procedures involved making multiple volume and mass measurements requiring training to master these techniques. Test kits offer advantages to the analyst in that they save time, are appropriate for field applications, and are generally user-friendly. Relatively unskilled staff can be trained to make accurate determinations using premixed liquid or solid reagents delivered in kit packaging.
Colorimetric test kits are among the simplest, quickest and most adaptable means by which water analysis may be performed in a host of environments and conditions. Tests often require little to no sample preparation and can be performed in minutes. Colorimetry is adaptable to field or lab work; low-cost visual test kits are portable and perfect for testing in the field whilst instrumental test kits may be better suited for lab work where more precise results are required. Measurement ranges vary depending on test type and analyte, but most tests can measure below one part per million (ppm), allowing for analysis even at low concentrations. Many instruments are small and portable, allowing precise results to be gathered in the field with ease. Colorimetric kits also take the stress away from testing; technical support is usually readily available, the kit’s quality control is the manufacturer’s responsibility and reagents are clearly labelled with expiration dates. When using a visual kit, the colour of the test result is compared to a chart or comparator of colors to determine the concentration. For instrumental kits, the sample is analysed in a spectrophotometer or colorimeter. These instruments measure the light absorbance at a specific wavelength which is then converted to the concentration of the analyte.
Colorimetric test kits are available for many analytes essential to industrial operations. For example, petroleum refiners commonly measure ammonia, phenols, iron and sulfide. The wastewater treatment industry monitors ammonia, chlorine and phosphates. The medical and food & beverage industries, meanwhile, test for residual disinfectants (chlorine, hydrogen peroxide, ozone, peracetic acid) to ensure sanitization is being performed correctly.
Industrial water treatment professionals are charged with maintaining water treatment programs that help extend equipment life, maximize energy efficiency, and reduce downtime. They are focused on controlling scale, corrosion and microbiological fouling in boiler and cooling systems. They monitor parameters such as dissolved oxygen, bromine, molybdate and various oxygen scavengers in order to make informed decisions about treatment adjustments. One common application of colorimetric testing is to spot check systems between reporting periods to document whether processes remain under control. Colorimetric test kits are also used alongside on-line analysers to verify their performance.
Colorimetric test kits continue to be practical tools for analysts. Their low cost, convenience, flexibility, accuracy and efficiency appeal to users in all industries. As testing needs evolve, colorimetric water analysis will continue to be an indispensable mainstay in the range of testing options. Analysts have been relying on CHEMetrics and its full line of visual and instrumental colorimetric water testing products for more than 50 years.
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Monitor water quality from home
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In times like during this covid-19 crisis, it is not always possible to be directly where your water quality monitoring system is located. Good
thing, nowadays you do not need to be in front of it to know what is going on and analyse results. s::can offer two solutions, for which you only need your smartphone to access your water quality data.
With Io::Tool you can visualise the data of the spectrometer probe spectro::lyser V3. Io::Tool is an intuitive web interface, which enables you to communicate with your V3 spectrometer without a terminal. With its ergonomic design, it is extremely easy to use. There is no need to install a software or download an app, simply use a web browser.
moni::app is an app that allows you to have an overview of your data from the s::can terminal con::cube on your smartphone. It tells you the current state of your s::can monitoring station and enables you to analyse the data history. Check all parameters, time series, the water’s spectral fingerprint and even the status of all your sensors.
Wherever you are, simply open the app and immediately find out what is going on in real-time.
Either way, both options allow you to have your water quality data at a glance, no matter if you are at home or at work.
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WWW.ENVIROTECH-ONLINE.COM IET ANNUAL BUYERS’ GUIDE 2020/21 High Quality Groundwater and Surface Water Monitoring Instrumentation
Solinst Canada Ltd., 35 Todd Road, Georgetown, ON L7G 4R8 Fax: +1 (905) 873-1992
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Solinst Levelogger App for Data Collection and Sharing
Combining the convenience and portability of smartphone technol- ogy, with the high quality Solinst dataloggers you have come to rely on, the Solinst Levelogger App and Interface provides a more efficient option to get the accurate water level data you need—when and where you need it.
The Levelogger App Interface uses Bluetooth® wireless technology to connect your Solinst datalogger to your smart device. The App Inter- face simply threads onto the end of a Levelogger’s Direct Read Cable, or LevelVent or AquaVent Wellhead, and is paired with your smart device running the Solinst Levelogger App.
With the Solinst Levelogger App, you can start and stop your dataloggers, download logged data, view and save real-time data, and program your datalogger with all the same options found in the Levelogger PC Soft- ware. Downloaded data logs and real-time data can be viewed on you smart device, e-mailed back to your office, or transferred directly to your PC.
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Accurately Monitor Water Conductivity
The LTC Levelogger Edge is a compact, sealed device that continuously measures water level fluctuations, temperature and conductivity. It is simply programmed using Levelogger PC Software to record at intervals as often as 2 seconds. Event-based and customized scheduled samplings are also options.
The LTC Levelogger Edge offers a number of useful features, including an 8-year battery life, memory for 27,000 sets of readings, and 6 pres- sure ranges. It also features a Titanium ceramic PVD corrosion resistant coating.
The 4-electrode platinum conductivity sensor has a wide calibrated con- ductivity range, with autoranging from 0 to 100,000 µS/cm. For highest accuracy, calibration is from 50 to 80,000 µS/cm. Ideal for providing a general indication of water quality.
The LTC Levelogger Edge is compatible with Solinst accessories including the DataGrabber data transfer device and Solinst Levelogger App and Interface. It can also be used with a Solinst Telemetry System for remote wireless monitoring.
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Reliable Water Level Dataloggers
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Providing worry-free, accurate water level data
The Levelogger Series of dataloggers are self-contained water level recorders. They combine a durable corrosion-resistant Hastelloy pressure sensor, robust and reliable memory, and a lithium battery in a compact body that is easy to deploy.
Downloading water level data in the field is made convenient using the Solinst Levelogger App for your smart device, or the DataGrabber™ USB data transfer device.
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