Справочник Пользователя для eutech-instruments waterproof c401 colorimeter

Measurement: Cyanuric Acid

 

 

C401/301/201/102/101 

 

 

 

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Samples may be collected in either plastic or glass bottles. It is advisable 
to wash the container with sample water before collecting the sample. 

Do not store the sample for more than 24 hours before conducting the 
analysis. 

Due to the nature of the test method, concentrations less than 5 ppm 
Cyanuric Acid are not detectable. 

Clean the vial immediately after taking and recording a reading. Do not 
leave the sample with added reagent into the vial for more than few 
minutes after measurement. The test will cause the build up of a cloudy 
layer on the inside wall of the vial.  It is important to thoroughly clean the 
vial after use to remove this layer because subsequent test results may be 
affected. 

Turbid samples should be filtered prior to analysis. 

A stock solution of 1000ppm Cyanuric Acid may be produced by dissolving 
exactly 1g of Cyanuric Acid in 1 litre of de-ionised water (check the purity 
of the Cyanuric acid being used; if less than 100%, adjust the amount 
used accordingly). 

The stock solution may then be diluted to give a Cyanuric Acid standard. 
To do this take a portion of the stock solution and make up to 1 litre using 
de-ionised water (for example, 50ml of stock solution will produce a 
50ppm standard). 

Prepare a standard in the range 

20-80 ppm (it is advisable to check a standard at near the concentration 
usually tested for using the meter).  Use this standard in place of the 
sample water in the above test method.  The result obtained should be 
approximately the value of the standard used (please refer to instrument’s 
specifications for data on meter precision and accuracy). 

 All instruments are factory calibrated and user 

calibration is not recommended. However, if a Cyanuric Acid standard can