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A number of methods have been developed to measure trace levels of H2S. The most widely used measurement methods include gold film analysers, SO2 conversion, colourimetric gas detection tubes, electrochemical detectors, and lead acetate cassette tape gas detectors.
H2S is nasty stuff. The colourless gas is not only unpleasant, giving off that all-too-familiar “rotten egg” smell, it is also poisonous, flammable (even explosive in high concentrations), and ultimately corrosive to metal and concrete. But H2S generation in sewers depends upon a fairly complicated biological, chemical, and physical process that is worthy of its own production pathway.
Agencies such as the Environmental Protection Agency (EPA) regulate and set strict limits on the amount of mercury vapour which can be present in air: 1μg/m3 for residential properties and 25μg/m3 for industrial properties. To ensure compliance with these regulations, industrial hygienists, clean-up crews and government agencies rely on portable instrumentation to measure mercury vapour levels on site. There are many different technologies which can be used to detect mercury, and some may be more appropriate in certain environments than others.
Water is the most abundant compound on the Earth’s surface, making up 71% of its surface area. It is a vital component for all known forms of life and is the aquatic habitat for thousands of species of microalgae, fish and shellfish...
Calcium Sulphate (CaSO4) more commonly known as gypsum is a naturally occurring white crystalline mineral that has many different uses and applications. When water is added to gypsum, the resulting gypsum paste can be moulded and shaped into various forms and dried to maintain its shape.
Whether it is fluorescent lighting, dental fillings, antique switches, gold mining or thermometers, the element mercury (Hg) is present in the world we live. Many of the mercury containing products give us comfort, are used to provide us with information, and even allow us to control our environment. While these products are safe, they could potentially expose people to a plethora of toxic compounds if an accident should occur.