chromotropic acid

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chro·mo·tro·pic ac·id

(krō'mō-trop'ik as'id),
Used as a reagent and in chromotropes.
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Method based on reaction of formaldehyde with chromotropic acid and determination of formaldehyde concentration.
Paraformaldehyde, MA (40% aqueous solution), PMSF, chromotropic acid, and sodium alginate were purchased from Sigma-Aldrich (Israel).
The chromotropic acid method was adopted for the analysis of formaldehyde in the rain waters [7].
* Chromotropic Acid Disodium salt Dihydrate (CTA), Fluka Chemie GmbH, Switzerland Freshly prepared solution of 0.2 % chromotropic acid in concentrated Sulfuric acid
The method can be summarized as follows: 4 mL of the scrubber's content and 0.1 mL of 1.0 percent chromotropic acid are poured in a 50-mL Pyrex[R] test tube with a screw-top cap.
A Spurway solution was used for nitrate extraction and nitrate concentration was determined with spectrophotometric analysis using chromotropic acid (West and Ramachandran, 1966).
Measurement of Formaldehyde Concentration Formaldehyde concentration will be measured applying the photocolorimetric method using chromotropic acid.
This was done using the hexavalent chromium (Cr(VI)) color reaction with chromotropic acid and by analysis of leachable Cr(VI) from sample borings/shavings.
Formaldehyde was quantified through the chromotropic acid method (NIOSH modified method), while methanol was quantified by gas chromatography/flame ionization detection (GC/FID).