The second in our series about Wagtech kits. Today we focus on the Potakit+ which enables users to ensure that water supplies are suitable for longer-term use. In addition, they are used in development situations and to increase local water-provision capacity.
The Potakit includes tests for ammonia, nitrate, nitrite, fluoride and arsenic (and chlorine for disinfection monitoring). These contaminants are commonly present in well and surface water, either naturally occurring or from anthropogenic sources, and long-term exposure can result in serious health problems. For example:
The Potakit+ uses two different visual methods of testing for chemical contaminants. The first is the Contour Comparator method, where a tablet reagent is added to the water sample and generates a colour response.
This colour can be related to the amount of the chemical present. For example, the nitrate test gives a range of red colours, with darker red colours indicating that more nitrate is present.
The sample is analysed by comparing the colour to a colour-wheel, which is made of calibrated colour petals. Finding the closest match gives the result of the test. This method of testing was pioneered by Palintest founder Dr Tom Palin in the 1940s and 1950s and gives excellent accuracy in the field.
The Potakit+ also contains a VCDK arsenic testing kit. This uses the Gutzeit method to convert total arsenic in the sample to arsine gas, which then reacts with an indicator paper to give a colour which is matched to a comparison chart to give a result.
The Potakit enables users to ensure that water supplies are suitable for longer-term use by populations, and are used in development situations and to increase local water-provision capacity.
21st November 2019
Our Application Scientist visited RedR UK to deliver water quality training at a week-long groundwater drilling course.
24th May 2019
Our team have compiled a list of their top tips to help ensure you get the best out of your Palintest equipment.