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HACH test kits



Which of the following test-kits from Hach
(http://www.hach.com/Prod/pparms.htm) will allow nitrate to be tested
     Nitrogen, inorganic
     Nitrogen, total Kjeldahl
     Nitrogen, total persulfate
     Nitrogen-ammonia 
     Nitrogen-ammonium
     Nitrogen-nitrate 
     Nitrogen-nitrite

rgds
Zon Hisham, Malaysia