S lovak Society of Actuaries

Metals in River Water

“…These include 1,5-diphenylcarbazide, 167,264,265 beryllon, 266 and iodide hexadecylpyridinium couplex. 267,268 A spectrophotometric method 264 for determination of total chromium in natural waters with high mineral contents (e.g., alkaline earths) is based on digestion of the sample at 80 °C with alkaline hydrogen peroxide followed by decomposition of excess hydrogen peroxide with trichloroacetic acid and addition of ethanolic diphenylcarbazide. The chromium-diphenyl carbazide complex is evaluated at 540-550 nm.…”