Precision and blank determination

The coefficient of variation estimated from samples with a Mn content of about 3 nmol/L by replicate measurements is between 5 and 10 %. This is in good agreement with the results of Klinkhammer (1980). 

The total blank is determined by extracting 100 g of ultrapure water and has usually been found not to differ from the reagent blank (of the order of 0.01 nmol/L). Random sources of contamination during analysis under clean-room conditions therefore can be neglected. 

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