Results 251 to 260 of about 517,075 (314)

Determination of total mercury in sediments and soils

The Analyst, 1972
A highly sensitive and precise procedure has been developed for the quantitative determination of total mercury in sediments and soils. Undried samples are treated with concentrated nitric and sulphuric acids, potassium permanganate and potassium persulphate in order to digest and oxidise all forms of mercury to mercury (II) ions, which are ...
I K, Iskandar, J K, Syers, L W, Jacobs, D R, Keeney, J T, Gilmour   +4 more
openaire   +2 more sources

Determination of Total Mercury in Soils and Sediments

Journal of Environmental Quality, 1975
AbstractA simple one‐step digestion procedure was evaluated for extracting total mercury from soils and sediments. The procedure evaluated involves digesting soil or sediment samples with concentrated HNO3 and 4N K2Cr2O7 (2:1, vol/vol) for 4 hours at 55C and analyzing mercury in the extract by flameless atomic absorption. Recovery of total mercury from
M. Floyd, L. E. Sommers
openaire   +1 more source

Total PCBs in Liverpool Bay sediments

Marine Environmental Research, 1996
The concentrations of 55 congeners of PCBs were determined in < 500 μm particles of 66 superficial sediment samples from Liverpool Bay. Total PCBs were significantly (p < 0.001) correlated with the amount of fine particles (r2 = 0.81) and with the organic carbon content (r2 = 0.80).
V.F. Camacho-Ibar, J. McEvoy
openaire   +1 more source

The ratio of measured to total sediment discharge

International Journal of Sediment Research, 2019
Abstract It is important to examine the ratio of measured to total sediment discharge to determine the error in measured sediment transport rates from depth-integrated samplers. The ratio of measured to total sediment discharge as well as the ratio of suspended to total sediment discharge are examined based on the Modified Einstein Procedure.
Chun-Yao Yang, Pierre Y. Julien
openaire   +1 more source

New Total Sediment‐Load Sampler

Journal of Hydraulic Engineering, 1992
A new total sediment-load sampler is designed and tested in a flume. The new instrument consists of a bed-load sampler and a suspended-load sampler, both attached to a supporting frame. The suspended-load sampler consists of seven intake nozzles, which are connected to plastic hoses and operated by pumps.
Leo C. Van Rijn, Moustafa T. K. Gaweesh
openaire   +1 more source

Determination of total chromium in sediments by FAAS

Fresenius' Journal of Analytical Chemistry, 1995
The determination of chromium by flame atomic absorption spectroscopy (FAAS), e.g. as performed for environmental matrices, is still a controversial matter as can be concluded from a literature review. Most controversy is due to the measurement conditions or the effect of the interferences; other conditions such as digestion seem to be less critical ...
A. Sahuquillo, R. Rubio, G. Rauret, B. Griepink   +3 more
openaire   +1 more source

Nitrate, Total Ammonia, and Total Suspended Sediments Modeling for the Mobile River Watershed

International Journal of Agricultural and Environmental Information Systems, 2017
This paper presents details of a water quality model of the Mobile River watershed that estimates total suspended sediments at the outlet of the watershed. The model is capable of simulating Nitrate (NO3), Total Ammonia (TAM), and Total Suspended Sediments (TSS) for extended periods of time at a daily temporal resolution (1970-1995).
Vladimir J. Alarcon, Gretchen F. Sassenrath   +1 more
openaire   +1 more source

The Total Sediment Load of Streams

Journal of the Hydraulics Division, 1958
Relationships proposed give both quantity and quality of total, suspended, and bed loads as functions of stream and sediment characteristics; in process of empirically defining relationships, encouraging correlation of laboratory and field data was obtained. (25 refs.)
openaire   +1 more source

Relationship between sediment clay minerals and total mercury

Journal of Environmental Science and Health, Part A, 2011
A group of 262 sediment samples were collected from various lakes, rivers, reservoirs, and bayous of Louisiana. All samples were analyzed for total mercury. Twenty nine of the samples with total mercury content ranging from 11 to 401 ppb (μg/kg) were analyzed for clay minerals and other sediment physical and chemical properties.
Manoch, Kongchum, Wayne H, Hudnall, R D, DeLaune   +2 more
openaire   +2 more sources

Influence of Sediment Preservation on Total Mercury and Methylmercury Analyses

Water, Air, and Soil Pollution, 1998
Estuarine and riverine sediments from fourlocations showing different sediment structures wereanalysed as fresh, thawed and lyophilised samples fortotal mercury (TotHg) and methylmercury (MeHg)concentrations, and results were compared to addresseffects of sample preservation on Hg speciation.
Muhaya, Bamba B.M., Leermakers, Martine, Baeyens, Willy   +2 more
openaire   +2 more sources