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Category: WATER QUALITY TALK

Home Blog

MONITORING TOC, BOD AND COD IN WATER WITH UV-VIS

September 20, 2018Real Tech

SPECTROPHOTOMETRY OVERVIEW Spectrophotometry is a well-established analytical method, which has been used for decades in chemistry, physics, biochemistry, and chemical engineering for quantitative analyses. A light source and sensor are used to measure the intensity of light passing through a water sample…

SPECIFIC ULTRAVIOLET ABSORBANCE (SUVA) AND UV254

August 27, 2018Real Tech

Specific ultraviolet absorbance (SUVA) provides a general characterization of the nature of natural organic matter (NOM) in a water sample and is typically performed for the purpose of determining disinfection by-product (DBP) formation potential. SUVA is calculated by dividing the…

BOD, COD, TOC, DOC AND UV254: AN ORGANICS TEST METHOD COMPARISON

June 18, 2018Real Tech

UV254, TOC, DOC, BOD and COD all provide measures of different aspects of the organic content in a water sample. Each of these parameters possesses a certain bias due to the nature of the particular test method: ABSORBANCE AT 254…

WHAT IS THE RELATIONSHIP BETWEEN ABSORBANCE AND CONCENTRATION?

April 17, 2018Real Tech

The relationship between absorbance and concentration is defined by Beer-Lambert Law (or Beer’s Law). Beer’s Law states that the absorbance of light absorbing matter in water is directly proportional to its concentration, expressed by the following equation: A = ε•b•c…

SOURCE WATER MONITORING: ORGANICS OR COLOUR

October 3, 2017Real Tech

When looking at source water monitoring for drinking water treatment, the terms colour and natural organic matter (NOM) are often interchanged. This may be due to organic matter, such as humic acids, causing visible colour in surface water. However, its…

ABSORBANCE AND PATH LENGTH

September 30, 2017Real Tech

According to Beer’s Law, absorbance is directly proportional to the path length of the UV light through the water sample. Absorbance is given by the following equation: UVA = ε•b•c where ε is the molar absorbtivity of the particular type…

BYPASS SENSOR OR SUBMERSIBLE PROBE

August 22, 2017Real Tech

When it comes to real-time water quality analysis, there two primary forms of instruments to choose from; a bypass style cabinet instrument or a submersible probe instrument. So what is the different between these two forms and how do you…

OVERVIEW: UV ABSORBANCE

June 29, 2017Real Tech

UV ABSORBANCE The UV absorbance is calculated as a relative measure of the amount of light absorbed by a water sample compared with the amount of light absorbed by a pure water sample. The sample water measurement is actually divided…

SHOULD I MEASURE UVT OR UVA?

April 8, 2017Real Tech

UVA and UVT are essentially just different representations of the same physical phenomenon. They can be related by a simple mathematical expression which indicates an inverse logarithmic relationship between UVA and UVT. UVA = 2 – log10 UVT Since UVT and…

WHAT IS UVT?

March 1, 2017Real Tech

Ultraviolet transmission or UV transmittance (UVT) is a water quality measurement. The method works by measuring the amount of UV light, typically at 254 nm, that is able to pass through a water sample of a given path length. It…

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