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Measuring Hints and General Test Information
• Samples containing more than 30 mg/L iron can yield inaccurate results and should
be diluted before testing. A 1:2 dilution is made by using 2.5 mL of sample water and
2.5 mL of deionized water. Multiply the test results by 2 to obtain the correct
mg/L iron. If this answer is greater than the answer obtained from the un-diluted test,
the results of the un-diluted test are probably wrong. The results of other dilutions
will follow a similar procedure; for example, the test results of a 1:5 dilution
(1 mL sample water and 4 mL deionized water) would be multiplied by 5 to obtain
the correct mg/L iron. (The dropper and deionized water used for dilutions are not
included in this kit. See REPLACEMENTS.)
• Wash all labware between tests. Contamination may alter test results. Clean with a
non-abrasive detergent or a solvent such as isopropyl alcohol. Use a soft cloth for
wiping or drying. Do not use paper towels or tissue on plastic tubes as this may
scratch them. Rinse with clean water (preferably deionized water).
• Rinse all viewing tubes thoroughly with the sample water before testing.
• To open PermaChem
1. Tap the bottom of the pillow on a hard surface.
2. Tear open the pillow along the dashed line.
3. Open the pillow and form a spout by squeezing the side edges.
4. Pour the contents into the sample.
• Accuracy is not affected by undissolved powder.
• To obtain a representative sample of water containing rust or precipitated iron, shake
the container and then take the test sample.
• If iron is present as dissolved iron, color will develop almost instantly. If iron is
present as rust, wait two to five minutes for complete color development.
• Hach strongly recommends that, for optimum test results, reagent accuracy be
checked with each new lot of reagents. Use the standard solution included in this kit
or listed in the OPTIONAL REAGENTS AND EQUIPMENT section. Follow the
instructions included with each standard solution.
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