Environmental Laboratory
Recent research of mercury pollution in fish and environmental samples
Mercury is a ubiquitous
heavy metal that biomagnifies at successively higher levels in the aquatic food chain. It can have adverse effects on the fish population itself as well as on both humans and fish-eating wildlife.
Mercury is a powerful neurotoxin and a persistent environmental contaminant that accumulates in the tissues of fish in regions where artisanal scale gold mining exists. Consuming contaminated fish is one of the primary Hg exposure pathways. Studies conducted by the Carnegie Institution for Science’s Department of Global Ecology found that many of the consumed fish species sold in the markets of Madre de Dios, an Amazonian region in southern Peru, had levels of mercury well above international reference limits. This indicated a serious public health and environmental problem.
Several methods exist for the determination of mercury in fish and biological tissues including cold vapor atomic adsorption (CVAA) and inductively coupled plasma-mass spectrometry (ICP-MS). Both require a preliminary sample pretreatment step of acid digestion.
On the other hand, the DMA-80 evo Direct Mercury Analyser from Milestone can measure total mercury in both solid and liquid matrices without any sample preparation, providing much faster analysis than conventional techniques.
More information online:
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New approach for environmental testing using ICP-OES outlined in new white Paper
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SPECTRO Analytical Instruments has published a new white paper, “A New Approach to ICP-OES Analysis for Environmental Testing.”
Environmental laboratories might like to standardise on one ICP-OES solution for most or all of their analysis needs. But different spectrometer types have different advantages and disadvantages for various applications. For instance, they derive diverse benefits from their internal plasma viewing technologies.
SPECTRO’s new white paper details how recent developments in viewing techniques helped create a versatile new type of spectrometer. Its brand-new dual side-on interface (DSOI) technology can offer significant advantages for environmental laboratories in routine applications, including waters, wastewaters, soils and sludges.
For instance, DSOI technology offers twice the sensitivity of conventional radial systems yet avoids the complexity, drawbacks, and cost of vertical dual view models. It provides high stability, the same high linearity as traditional radial-observation ICP-OES, improved ease of use and less maintenance requirements than vertical dual view systems. Additional advantages of the technique: only a measurement, using a single plasma view, is needed — a definite speed advantage compared to dual-view spectrometers.
More information online:
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New automatic colour spectrometer for edible oils
The Lovibond® Colour Measurement Team announces the availability of the Model Fx, the new automatic colour spectrophotometer designed for use in the edible oils market. The Model Fx measures Lovibond® RYBN, Lovibond RY10:1, AOCS RY, chlorophyll and b-carotene, ensuring compliance to standards on an international scale. Uniquely, however, the Model Fx allows the measurement of hot samples with its integrated heater. Moreover, it also reports the oil’s sample temperature to avoid mis-readings from crystallisation.
The increasing trend of oil usage worldwide and the resultant effect on price fluctuations is driving the need for more accurate analysis within the supply chain. Non-repetitive analysis across refineries, however, is still an issue.
Many edible oils are also unique in their fractionation – resulting in different melting points for different applications. This makes the sample temperature, and sample heating to maintain the temperature during measurement, more important since temperature and colour go hand in hand.
Temperature and duration times must be accurately set to ensure heating to the full liquid phase for measurement, while bearing in mind that overheating can cause the oil to turn darker. Microwave heating is faster but may not result in uniform temperatures of the oil.
Further, due to the high melt temperature, certain oils shorten very quickly: as soon as the temperature is removed, they start to solidify, visually turning the sample increasingly whiter.
Matthew Russell, International Sales Manager for Lovibond’s range of colour measurement products stated, “The Lovibond® Model Fx solves the problem of measuring the colour of edible oils with its unique ability to not only keep the oil at a constant temperature but also to measure and report on the temperature of the sample, avoiding any mis-readings from crystallization.”
More information online:
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50312pr@reply-direct.com Ad - Envirotech -
DAQ.indd 1 11/09/2019 14:47:20
www.envirotech-online.com IET September / October 2019
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