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The hydrogen chromate ion may be protonated, with the formation of molecular chromic acid, H 2 CrO 4, but the pK a for the equilibrium H 2 CrO 4 ⇌ HCrO − 4 + H + is not well characterized. Reported values vary between about −0.8 and 1.6. [4] The dichromate ion is a somewhat weaker base than the chromate ion: [5]
pyridinium dichromate (PDC) is the pyridium salt of dichromate, [Cr 2 O 7] 2-. pyridinium chlorochromate (PCC) is the pyridinium salt of [CrO 3 Cl] −. These salts are less reactive, more easily handled, and more selective than Collins reagent in oxidations of alcohols.
Zinc chromate, Zn Cr O 4, is a chemical compound, a salt containing the chromate anion, appearing as odorless yellow powder or yellow-green crystals, but, when used for coatings, pigments are often added. [2] [3] [4] It is used industrially in chromate conversion coatings, having been developed by the Ford Motor Company in the 1920s. [5]
Chromate-dyed textiles or chromate-tanned leather shoes can cause skin sensitivity. [15] In the U.S., the OSHA PEL for airborne exposures to hexavalent chromium is 5 μg/m 3. [16] [17] The U.S. National Institute for Occupational Safety and Health proposed a REL of 0.2 μg/m 3 for airborne exposures to hexavalent chromium. [18]
The Cronak process is a conventional chromate conversion coating process developed in 1933 by The New Jersey Zinc Company. [1] It involves immersing a zinc or zinc-plated article for 5 to 15 seconds in a chromate solution, typically prepared from sodium dichromate and sulfuric acid. [2]
Walmart announced Tuesday it will offer same-day prescription delivery services in six states, with a plan to roll out to all 49 states in which it operates a pharmacy in by January.The first six ...
In 2005–06, potassium dichromate was the 11th-most-prevalent allergen in patch tests (4.8%). [12] Potassium dichromate is one of the most common causes of chromium dermatitis; [13] chromium is highly likely to induce sensitization leading to dermatitis, especially of the hand and forearms, which is chronic and difficult to treat ...
The deaerator internals comprise three packed beds. Deaerated water is taken from the base of the deaerator by transfer pumps which deliver 1632 m 3 /hr at 3.6 barg to the degasser surge drum. [4] From the surge drum water is transferred to the water injection pumps which deliver water at up to 250,000 BWPD to up to 11 water injection wells. [5]
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