Product category:
Chemical analysis equipment
News Release from: Palintest | Subject: OP test
Edited by the Laboratorytalk Editorial
Team on 15 August 2002
Easy test for scale and corrosion
inhibitor
Fast testing of organoposphonate levels in boiler and cooling water without the traditional problems of pH adjustment and end-point determination
Palintest has introduced an improved, easy to use organophosphonate test for monitoring OP levels in boiler and cooling water systems Using a specially developed tablet containing a pH buffer and screened indicator, this new test eliminates the problems of pH adjustment and end-point determination associated with the traditional test, making it more consistent and more accurate
This article was originally published on Laboratorytalk on 22 Jan 2002 at 8.00am (UK)
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Low levels of organo-phosphonate compounds are now used worldwide as scale and corrosion inhibitors in boiler and cooling water applications.
Monitoring is essential to ensure the treatment is fully effective but, until now, this has been problematic and testing has produced questionable results.
The level of OP in a solution is ascertained by measuring the volume of a thorium nitrate reagent required to complete a reaction with it, using xylenol orange as an indicator.
Traditionally, this had to be done under precise pH conditions, often requiring a pH correction procedure first, and the result was difficult to determine due to a poor colour change.
The Palintest OP test uses a tablet which combines a pH adjuster and buffer mixture together with a screened xylenol orange indicator.
This is simply dissolved in the sample to provide the correct pH conditions for the test.
The screened indicator then produces an obvious colour change from green to purple only as the decisive drop of thorium nitrate is added.
The microburette for adding the thorium nitrate is directly calibrated to OP concentration and provides a readout to a precision of 0.4mg/l.
The test has been developed for use with the most common commercially available OP products, and dechlorinating and defluorinating agents have been incorporated so that the test can be used on systems also being treated with chlorine and fluoride compounds.
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