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    Hi there,

    I've shot myself in the foot a little with a project I have to complete before the end of half term and am wondering if anyone has the know how to help me out a little.

    My project was to test for ammonia levels in watercourses near farm land and to do this I was given a water testing kit that uses two different tablets. These are added to the sample and the colouration of the water sample lets you know the mg/l of NH4 you have in the sample.

    On the packet, it says that one of the tablets is Sodium Nitroprusside/Salicyclic acid and the other one is Lithium hydroxide.

    Is there anyone out there who could give me an insight into the chemical reaction that is taking place here? I have done a fair bit of research but am not turning up much helpful information.

    An image of the kit:

 
 
 
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