Issues regarding the determination of iron content in tap water using a spectrophotometer
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Yesterday, I used a spectrophotometer to measure the iron content in tap water. Using a blank sample (company-produced deionized water), the iron content in this blank was found to be 0.8 ppm. After making adjustments to zero, the iron content in the tap water was measured to be around 1 ppm. Could you tell me whether this level of iron content in the blank sample has an impact on the measurement of my samples? Thank you.
Your blank value is too high; such a high blank value is not sufficient to reflect the actual content of the sample. I have checked the water used for preparing reagents and cleaning vessels, and I believe your water blank value is too high. Test the iron ions in the distilled water you produce for use, and you can also use purified water available on the market as a control. I suspect that your deionized water is contaminated during storage and transportation, which causes the blank values to be high.
A high value for the blank should not have an impact on the final test results, right? ! ! ! ! ! ! ! ! ! ! !
For the measurement of substances with low concentrations, the blank must not contain the substance being measured