ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Determination of chromium by diphenylcarbazide in water with a high content of inorganic substances

A. Bíliková and V. Bílik

Forschungsinstitut für Wasserwirtschaft, Bratislava

Abstract: The diphenylcarbazide method was modified for the detn. of μg. amts. of Cr in H₂O in the presence of higher amts. of Ca, Sr, and Ba. Trichloroacetic acid is used in place of H₂SO₄ to form an acid medium and a stable colored complex is formed. To det. Cr, 2 ml. M trichloroacetic acid and 1 ml. 1% alc. soln. diphenylcarbazide are added to 10-90 ml. sample contg. 5-100 μg. Cr(VI), and the soln. is dild. to 100 ml. The absorbance is measured after 10 min. on a Pulfrich photometer with an S-55 filter. To det. the total amt. of Cr, 1 ml. M NaOH is added to the sample, and the soln. is heated to 80-90°. After adding 0.5 ml. 30% H₂O₂, it is allowed to stand 30-40 min. Excess H₂O₂ is boiled off and the balance of the detn. is the same as for Cr(VI). This method is specific and sensitive.

Full paper in Portable Document Format: 2211a873.pdf (in Slovak)

Chemical Papers 22 (11) 873–878 (1968)