Monitoring of Ba, Mn, Cu and Ni During Estuarine Mixing.

Abstract

Practical clean analytical methods for the monitoring of Ba, Mn, Cu and Ni in estuarine waters with salinity ranging from near zero to about 32 %o are reported. Three longitudinal surveys were conducted on the levels of Ba, Mn, Cu and Ni for Selangor River and Klang River from the upper estuary freshwater points to the river mouth. In addition, monitoring of dissolved Ba were carried out at a fixed estuarine station of the Selangor River over the daily flood-ebb tidal cycles for a neap tide and two spring tide occassions. The longitudinal surveys show both input and removal of the trace metals monitored during estuarine mixing. The fixed station study shows that the concentrations of dissolved Ba vary in the range from 3.4 to 5.7 .tg/L for neap tide samples, whereas concentrations ranging from 6 to 120 .tg/L were observed for spring tide samples. Variations of the trace metal concentrations over the daily tidal cycles and sample standing were dependent on the water salinity, pH, dissolved oxygen and suspended solids levels.

Determination of cadmium and lead in human urine by STAT-FAAS after enrichment on activated carbon

“…elements in estuarine waters prior to determination by ICP-Resins containing iminodiacetate groups such as Chelex 100 AES. 146 A micro ion-exchange column was used successfully found widespread use for preconcentration of various trace for concentration of ultra-trace REEs in raw, purified and tap elements in natural water, 115,116 mineral water,117 freshwater118 water prior to determination by ICP-MS. 147 Detection limits and sea-waters. [119][120][121][122][123][124] The effectiveness of resins containing ranged from 0.03-0.4 pg ml−1 for a preconcentration factor nitriloacetate for preconcentration of trace metals from seaof 100.…”