If I have sample (corned beef) 10 g and the maximum nitrite it contains is 30 mg/kg, what is the maximum nitrite in µM?

Dear Nira,

Parts per million (ppm) is a unit of concentration. When the concentration of a substance is low, such as water contaminated with certain metals (iron, cadmium, or magnesium), ppm becomes more convenient than standard units of concentration – molarity or weight percent – used in chemistry. A mole is a unit in chemistry that measures the amount of substance. To make basic stoichiometric chemical calculations, you need to convert ppm to moles or micromoles.

Multiply ppm by the weight of the solution, then divide by 1,000,000 to compute the mass of the compound. For example, if ppm of cadmium (Cd) is 20 and the mass of the solution is 500 grams, then the mass of the dissolved cadmium is (20 x 500) /1,000,000 = 0.01 grams.

Get the atomic mass of the element present in water from the Periodic Table of the Elements. In this example, the atomic mass of cadmium (Cd) is 112.

Divide the weight of the compound by the atomic mass to calculate the number of moles. In this example, the number of moles is 0.01 / 112 = 0.000089 moles.

Multiply the number of moles by 1,000,000 to calculate micromoles. In this example 0.000089 x 1,000,000 = 89 micromoles. https://sciencing.com/conversion-ppm-micromoles-8656294.html

Or may this helps http://www.endmemo.com/medical/unitconvert/Phenobarbital.php

Best Regards,

Sergio Grunbaum

To convert mg/kg to µM, we need to use the molecular weight of nitrite (NO2-) and Avogadro's number. The molecular weight of NO2- is 46.0055 g/mol, and Avogadro's number is 6.022 x 10^23 mol^-1.

First, we need to calculate the total amount of nitrite in the 10 g of corned beef:

30 mg/kg = 30 mg/1000 g = 0.03 mg/g

So, in 10 g of corned beef, the total amount of nitrite is:

0.03 mg/g x 10 g = 0.3 mg

To convert mg to µM, we need to divide the mass by the molecular weight and multiply by 1000 (to convert mg to g) and then by 10^6 (to convert to µM):

0.3 mg / 46.0055 g/mol x 1000 mg/g x 10^6 µM/M = 6526.87 µM

Therefore, the maximum nitrite in µM in the 10 g of corned beef is 6526.87 µM.

Note: The ISO 2918-1975 standard method may provide a different conversion factor or a different limit, so it's important to follow the specific guidelines of the method you are using for accurate results.

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