46 Water / Wastewater


Aquaread Launch new PRO range of multiparameter water monitoring instruments The PRO range come complete with all the key water


The PRO range builds on the success of the Aquaprobe and Aquasonde series, elevating every aspect of the construction, design, features and specifi cations. They bring with them new- to-industry materials allowing measurement at far greater depths, a unique measurement chamber for improved sensor stability in the most demanding applications and smart sensors that hold their calibration data, allowing for simple sensor exchange in the fi eld.


Both the Aquaprobe (AP) and Aquasonde (AS) models of the PRO range feature a combination of titanium and carbon fi bre, offering both exceptional corrosion resistance and high compressive strength. As a result, both are capable of measuring at extreme depths of up to 1000ft (300m).


The protective end cap, found on all Aquaprobes, has been extended along the inside of the sleeve. When screwed onto the sleeve it creates a more stable measurement chamber for all installed sensors. Its matt black design prevents refl ection and the sealed environment is not subject to interference from stray light.


The measurement chamber can also be used for sensor calibration using the calibration cup that push-fi ts to the base of the probe. This surrounds and seals the holes and allows the probe to stand upright. Utilising the measurement chamber for calibration in this way reduces the volume of calibration solution required, reducing maintenance costs.


The range sees the introduction of smart sensors, sensors that hold calibration data allowing exchange without the need to recalibrate. Sensors can be carefully calibrated in the lab and taken to the deployment site for simple exchange, removing the need to calibrate in the fi eld.


quality smart sensors as standard and is equipped with a self-cleaning system to keep them clean for prolonged monitoring. Standard sensors include optical dissolved oxygen, conductivity, pH, ORP, temperature and depth.


Four Auxiliary ports allow extra smart sensors to be installed, diversifying monitoring options.


The AS-PRO is fi tted with a novel three-position switch ring mechanism allowing you to confi dently switch the function of the sonde. Using the switch ring you can turn the unit off, set it to auto or activate Bluetooth mode. The switch ring includes multi-coloured LED for various indications.


When in Auto mode the sonde will detect if its connector has been blanked off, if it’s connected to a vented cable, if it’s connected to an Aquameter or if it’s connected to a PC via USB, and reacts accordingly.


When set to Bluetooth mode, using the SondeLink App, the user can take live data readings, calibrate the Sonde, set-up the logging regime, check battery and memory levels and upload logged data from the Sonde to the PC.


“The new PRO range expands our capabilities and opens-up new markets for us, it is already proving incredibly popular with our distributors and with our customers. We are very excited to bring this new product to the water monitoring industry this year.” Says Aquaread’s managing director Craig Harrison.


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email: Safe, reliable, easy COD analysis in high chloride water samples


COD testing can be diffi cult in industrial or marine samples with high background chloride levels. However, Hach’s COD test kits enable safe, easy, and reliable COD testing from 7 – 1000 mg/L in water and wastewater samples with chloride concentrations up to 20,000 mg/L.


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COD is a key measure of organic pollution, but some samples represent a greater analytical challenge. These include high concentrations of chloride in industrial samples or seawater.


When treated wastewater is discharged into the environment, it can introduce pollution in the form of organic compounds to receiving waters, and COD (Chemical Oxygen Demand) is a key measure of organic pollution. Reliable COD results are therefore extremely important since this parameter often determines the discharge fees, which represent large sums of money. The basis for the COD test is that nearly all organic compounds are fully oxidised to CO2 using dichromate under a high temperature and strong acidic conditions. These harsh analytical conditions also oxidise chloride, but in standard COD tests, mercury sulphate is used to mask chloride concentrations up to 1000 mg/L.


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Higher chloride concentrations falsify the COD results unless additional steps are taken. Simply diluting samples to concentrations lower than 1000 mg/L chloride is often not an option because of either too low COD concentrations or too high dilution factors resulting in false COD readings.


Today, many environmental laboratories still use the standard COD method (macro method according to ISO6060 or similar national norms), manually adding


additional mercury sulphate to the sample prior to digestion. Other laboratories perform a very complex chloride depletion, adding concentrated sulphuric acid to the sample. While cooling, the prepared sample is stirred (fume hood required) to remove excessive chloride as HCl.


These options often lead to a high level of uncertainty in COD results, and the materials are diffi cult to handle due to large amounts of highly toxic and corrosive reagents which are problematic and expensive to dispose of.


With Hach’s test kits LCK 1714, LCK1814 and LCK1914, new analytical methods are now available for the photometric detection of COD in saltwater samples. Three different measuring ranges cover COD concentrations between 7 and 1000 mg/L. The kits provide excellent comparability with standard method results, but offer the additional advantage of being much easier to handle.


The new COD test kits for water samples that have up to 20,000 mg/L chloride are easy to use - the method can be easily performed in all laboratories using Hach’s standard photometric equipment (DR3900 or DR6000 spectrophotometer, heating block). They are also safe to use: no direct contact with toxic reagents. The LCK cuvette test does not require: additional mixing of reagents; cumbersome sample pretreatment; titration, or glassware cleaning. These kits are accepted by international environmental agencies worldwide.


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