Can anyone suggest feasible method for Nitrate & Nitrite determination from dry powdered samples ?

How to compare two groups with only two measurements?

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Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

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What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

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Do we need to write protocol for a second study of a systematic review that has been registered and published?

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How to increase a model accuracy ?

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Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

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Sample dilution for quantitative analysis using ELISA?

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Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

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How to calculate average trend in maximum annual NDVI from MODIS?

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Kushal Biswas

To determine Nitrate and Nitrite, you may follow the attached papers.

Charlotte Mills

It depends what the powders are? Are they soluble in water? If so you could determine the levels in water and subtract from the levels in the solution. If not, you'll need to look at an extraction process.

The Griess assay is a valid option, but you might want to consider Ozone chemiluminescence, probably a more reliable method.

Jai Ghosh

Kushal has rightly answered your question. Why don't you do some browsing of the net and who knows you may get something better than what Kushal is referring.