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1. Home Vegetable Testing for Nitrate
Take a small portion of a vegetable (either fresh or canned) and squeeze it
with a garlic press to extract the liquid portion of the vegetable. Use
one drop (0.05 ml) to test for Nitrate using the NECi Field NTK - Standard Range
(no special equipment required to use this NECi NTK). Nitrate will only be
detected if the vegetable has a high nitrate content. To figure out how
much nitrate you are getting when eating this vegetable, compare the amount of
vegetable extracted to the amount you usually eat at one time. If the
Nitrate content of the vegetable extract is high (5 to 10 ppm Nitrate-N), then
you have an estimate of the amount of nitrate you are getting from the
consumption of the vegetable tested. Most vegetables have a low nitrate
content with root vegetables (carrots, beets, etc.), leafy vegetables
(spinach, lettuce, chard, etc.) and some legumes (green beans) being the exceptions. If you
are drinking water that is pretty much nitrate free, then you do not have to
worry too much about taking a bit of nitrate in your food. Talk to your physician
if you are concerned about your nitrate intake.
2. Salt-Water Fish Tank Nitrate Testing
Water from any fish tank, for both fresh and salt-water systems, can be
tested for Nitrate using the NECi Environmental Field NTK - Standard Range (no special
equipment required to use the NECi
E-NTK). Simply take 1 drop (0.05 ml) of
the water and run the Nitrate test as per the instructions in the E-NTK.
Salt-water does not interfere with the NECi Environmental Field NTK - Standard Range test for
Nitrate. If you find the Nitrate content of your fish tank water is high
(5 to 10 ppm Nitrate-N), then consider changing the water more often to keep the
Nitrate content lower (as long as the water you use is low in Nitrate content --
your water source can also be tested for Nitrate with the Field-NTK to be sure
you are using low Nitrate water to put in your fish tank or make your
salt-water). Consult your pet store or a reference book to decide what the
limit for Nitrate in your fish tank should be.
3. Storing Nitrate Reductase (NaR) for Multiple Uses
The enzyme Nitrate Reductase (NaR) is used in all NECi NTK. In general, NECi NTK
are designed for running a set of 18 to 25 samples at one time and so there is
no need to store the NaR when following the protocol provided with the kit you
bought. However, if you do not have that many samples to test at one time,
you may want to use the NECi Prepacked Enzyme Diluent to prepare your NaR so
that you can store it in your freezer between uses. Just tell us the next
time you order and we will include a Prepacked Enzyme Diluent with your
NTK. Here is the protocol for using the NECi Prepacked Enzyme Diluent (PDF
file*): NaR Storage
4. Confused by Nitrate Units of Measure?
Nitrate content of water and other samples is reported in several different
units depending on where you limit. The US EPA sets the Maximum Content
Limit of Nitrate in water as 10 ppm Nitrate-N. NECi bases the instructions
for all NTK on the US EPA units of 10 ppm Nitrate-N. However, in
California and Europe, the Nitrate content of water is expressed as ppm Nitrate
with the Limit being 45 to 50 ppm Nitrate. To help with overcoming this
confusing situation NECi has prepared a Table for Conversion of Nitrate Units
(PDF file*): Nitrate Units
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