ICP-OES 5110 Sulfur

I have a problem measuring sulfur in a nickel solution.

The Ni concentration in the product is about 15%. I measure once a solution with 1g/100 ml and once with 1g/200 ml in nitric acid.

With the 1:100 measurement I get twice as high values as with the 1:200 measurement.

The dilution factors are entered correctly.

At the same time sodium is measured, there I do not have the problems.

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