Hanna instruments, the makers of those popular little Hanna Checkers has released a few new checkers. The new checkers include Color of Water, and Chromium VI High. While they might not be the best for saltwater application, this is good news that they have released these new checkers. Hanna has been working on calcium and magnesium with numerous delays on trying to get the complex mix right. Hanna has told us they are “still working on them” with still no estimated date of arrival. With this new release perhaps they can focus all of their efforts on the calcium and magnesium versions? The new Color of water and Chromium VI High have an MSRP of $50 and we have more information about these specific checkers below the break.
About Chromium VI High Checker:
There are two natural forms of ionic chromium, the hexavalent ion, Cr (VI) and the trivalent Cr (III). Cr (III) is much less toxic than Cr (VI) and seldom found in potable waters. Cr (VI), however, is toxic to humans and is found in water. Even though the toxic effects from Cr (VI) in drinking water are not well documented, it is a suspected carcinogen. The maximum permissible level or Cr (VI) allowed to be released into the waterways is 50 ppb. Its level in drinking water is normally much lower and a lever higher than 3 ppb is suggestive of industrial pollution.
About color of water:
True color is caused by dissolved compounds in water. It can be natural or artificial. Dissolved and suspended solids (together) cause apparent color. Color is measured in Platinum-Cobalt units. The AWWA recommends ? 15 PCU. The HI 727 Checker®HC is extremely simple to use. First, zero the instrument with deionized water. Next, prepare the sample according to the Apparent/True color measurement. Place the second vial with prepared sample into the Checker®HC, press the operational button and the
HI 727 Checker®HC displays the color of water in PCU.