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nZVI Tester - Simple Device for Measurement of Reactive Zero-Valent Iron

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Simple device for measurement of reactive zero-valent iron content in a slurry or powder. nZVI TESTER provides simple and fast measurement of zero-valent iron concentration in a product, even under the field conditions. The apparatus can be used for analysis of Fe(0) content in dry powder or slurry.
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The method is based on the measurement of hydrogen volume, which is evolving during chemical reaction ofzero-valent iron and an acid. This test is very simple and particularly fair minded: the volume of hydrogen is directly proportional to the amount of ZVI. The amount of iron-oxides does not influence the volume of generated hydrogen, it only slows down the reaction speed.

The "Hydrogen method" has been compared to Mossbauer spectroscopy and X-ray powder diffraction - please see the following chart:

Reaction of nZVI and the acid proceeds according to the formula:

2KHSO4 + Fe -> FeSO4 + K2SO4 + H2
55,85 g Fe-> 22,41 dm3 H2

From the previous formula it comes through, that 22,41 dm of hydrogen is generated by reaction of 55,85 g of iron and sufficient  amount  of acid  (KHS04).  The  weight  and  the concentration of nZVI in slurry is consequently calculated from the volume of evolved hydrogen.