Merck KGaA, Darmstadt, Germany

Sensitive Determination of Iron in Drinking Water, Mineral Water, Groundwater, and Spring Water Using Rapid Photometric Tests

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originally published in Supelco®'s Analytix Reporter Journal Issue 2 2018 by Merck KGaA, Darmstadt, Germany
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The quality of drinking water is regulated by a variety of guidelines, such as the EU Council Directive 98/831,2 and WHO guideline.3 The key principles used to define these limits consider both health hazards and sensory and technical reasons. Iron, for example, does not exhibit a risk for health in concentrations usually found in drinking water.2,3 However, increased concentrations of iron result in the formation of iron hydroxide products, which can form deposits in water pipe systems and a brown discoloration of the water.4

To ensure the supply of clear and colorless water, country-specific limits have been set for drinking  water. The limit for iron set by the EU directive is 0.2 mg/L Fe,2 while the U.S. EPA specifies 0.3 mg/l Fe.5 To prevent the formation of iron deposits in water pipe systems, a limit of 0.02 mg/L should not be exceeded.6 To ensure that the specified limits are met, drinking water is, in many cases, subjected to a treatment step in which the iron is precipitated. This method virtually eliminates any iron content, reducing the iron concentration to the lower ppb range.6

Read the full article online on SigmaAldrich.com.

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