Nitrate, reagent for photometer

General description
REAGENTS MUST BE USED WITH THE CORRESPONDING PHOTOMETER.
REQUESTER MUST SPECIFY THE PHOTOMETER BRAND AND MODEL.

The following quantities are indicative and vary between suppliers.
Detection range: approximately 0 - 10 mg/l N (range can be extended by dilution)
Number of tests in a box: between 200 and 250.
Minimum shelf life: 24 months

WHO health based guideline value: 50 mg/l N

Conversion factor: 1 mg/l as nitrate (NO3) = 0.226 mg/l as nitrate ion (N)

Nitrate is found naturally in the environment and is an important plant nutrient. Nitrate can reach both surface water and groundwater as a consequence of agricultural activity.
In general, the most important source of human exposure to nitrate is through vegetables and through meat, however in the case of bottle-fed infants, drinking water can be the major external source of exposure to nitrate, which increases the risk of methaemoglobinaemia for those infants.

For additional information, please consult WHO website on chemical hazards in drinking water.
WHO chemical hazards in drinking water