Estimated loads of suspended sediment and selected trace elements transported through the Clark Fork basin, Montana, in selected periods before and after the breach of Milltown Dam (water years 1985-2009)

2011 ◽  
Author(s):  
Steven K. Sando ◽  
John H. Lambing
Keyword(s):  
Trace Elements ◽  
Suspended Sediment ◽  
Before And After

Changes in the serum level of the trace elements in chronic renal

2021 ◽  
Vol 2 (3) ◽  
pp. 402-409
Author(s):  
Baghdad Science Journal
Keyword(s):  
Trace Elements ◽  
Serum Level ◽  
Blood Serum ◽  
Healthy People ◽  
Control Group ◽  
Before And After ◽  
Iron And Zinc

Were studied changes in the concentration of copper, iron and zinc in blood serum of one hundred patients with chronic kidney and treated dialysis blood were also measured the level of calcium kidney and phosphate Calciotropic in serum of these patients took samples of blood from these patients before and after treatment dialysis vessels as well as the statement of changes in those standards Alkimaahiatih Results were compared with twenty-five healthy people (control group)

PRE- AND POSTOPERATIVE EXCRETION OF TRACE ELEMENTS IN PRIMARY HYPERPARATHYROIDISM

1969 ◽  
Vol 60 (3) ◽  
pp. 380-388 ◽  
Author(s):  
Harry Boström ◽  
Per Olov Wester
Keyword(s):  
Trace Elements ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Primary Hyperparathyroidism ◽  
Urinary Excretion ◽  
Healthy Subjects ◽  
Biological Significance ◽  
Urinary Levels ◽  
Before And After ◽  
Exchange Technique

ABSTRACT A comparison of the range of urinary excretion of 20 elements (Ag, As, Au, Br, Ce, Cd, Cs, Cu, Fe, Hg, La, Mg, Mo, Rb, Sb, Sc, Se, Sm, W, Zn) in healthy subjects as well as in patients with primary hyperparathyroidism before and after operation was performed by means of a recently developed ion-exchange technique following neutron activation analysis. The urinary levels of the 20 trace elements showed no distinct differences when the controls were compared with the untreated cases of hyperparathyroidism. Small differences in the urinary excretion of certain trace elements in patients with hyperparathyroidism before and after operation were, however, revealed. The biological significance of these findings is discussed.

Changes in the Serum Levels of Trace Elements Before and After the Operation in Thyroid Cancer Patients

2016 ◽  
Vol 175 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Abdulkerim Kasim Baltaci ◽  
Tugrul Kadir Dundar ◽  
Faruk Aksoy ◽  
Rasim Mogulkoc
Keyword(s):  
Trace Elements ◽  
Thyroid Cancer ◽  
Cancer Patients ◽  
Serum Levels ◽  
Before And After

scholarly journals Reduced fine sediment flux in response to the managed diversion of an upland river channel

2015 ◽  
Vol 3 (4) ◽  
pp. 1179-1220
Author(s):  
M. T. Perks ◽  
J. Warburton
Keyword(s):  
Suspended Sediment ◽  
Fine Sediment ◽  
Sediment Flux ◽  
Analysis Of Covariance ◽  
Before And After ◽  
Suspended Sediment Concentrations ◽  
Sediment Transfer ◽  
The Uk ◽  
The Impact ◽  
B Coefficients

Abstract. This paper describes the implementation of a novel mitigation approach and subsequent adaptive management, designed to reduce the transfer of fine sediment in Glaisdale Beck; a small upland catchment in the UK. Hydro-meteorological and suspended sediment datasets are collected over a two year period spanning pre- and post-diversion periods in order to assess the impact of the channel reconfiguration scheme on the fluvial suspended sediment dynamics. Analysis of the river response demonstrates that the fluvial sediment system has become more restrictive with reduced fine sediment transfer. This is characterised by reductions in flow-weighted mean suspended sediment concentrations from 77.93 mg L−1 prior to mitigation, to 74.36 mg L−1 following the diversion. A Mann–Whitney U test found statistically significant differences (p < 0.001) between the pre- and post-monitoring median SSCs. Whilst application of one-way analysis of covariance (ANCOVA) on the coefficients of sediment rating curves developed before and after the diversion found statistically significant differences (p < 0.001), with both Log a and b coefficients becoming smaller following the diversion. Non-parametric analysis indicates a reduction in residuals through time (p < 0.001), with the developed LOWESS model over-predicting sediment concentrations as the channel stabilises. However, the channel is continuing to adjust to the reconfigured morphology, with evidence of a headward propagating knickpoint which has migrated 120 m at an exponentially decreasing rate over the last 7 years since diversion. The study demonstrates that channel reconfiguration can be effective in mitigating fine sediment flux in upland streams but the full value of this may take many years to achieve whilst the fluvial system, slowly readjusts.

scholarly journals Changing the Hydrogeochemical Condition in the Eastern Donbass for 25 years

2019 ◽  
Author(s):  
А.И. Гавришин
Keyword(s):  
Trace Elements ◽  
Mine Water ◽  
Negative Impact ◽  
Coal Mines ◽  
Average Concentration ◽  
Coal Industry ◽  
Domestic Water ◽  
Mine Waters ◽  
Significant Deterioration ◽  
Before And After

Многие десятилетия угледобывающая промышленность оказывает интенсивное негативное влияние на все компоненты окружающей среды в Восточном Донбассе. Одним из наиболее мощных факторов преобразования гидрогеохимических условий являются шахтные воды. Особенно интенсивные изменения концентраций макрокомпонентов в шахтных водах произошли в последние 25 лет поле массовой ликвидации угольных шахт в регионе. Для всех лимитируемых макрокомпонентов обнаружено превышение ПДК вод хозяйственнопитьевого и культурнобытового водопользования по средним концентрациям, а для некоторых компонентов даже по минимальным значениям. По средним концентрациям 20ти микроэлементов превышение ПДК обнаружено в 53х компонентов, по максимальным концентрациям в 73. Средние концентрации по ряду элементов в десятки раз превышают соответствующие ПДК, а по максимальным концентрациям превышение составляет сотни раз. В грунтовых и поверхностных водах произошло увеличение средних, медианных и максимальных концентраций макрокомпонентов в 1,220 раза. По средним концентрациям превышение ПДК отмечено для 67, а по максимальным для 83 100 лимитируемых компонентов. Для средних концентраций микроэлементов в грунтовых водах превышение отмечено в 40, а для максимальных значений в 67 случаев. Средние концентрации микроэлементов превышают ПДК в несколько раз, максимальные концентрации в десятки раз. После ликвидации угольных шахт, произошло резкое усилении процессов окисления сульфидов и серы, содержащихся в углях и вмещающих горных породах, и растворение сульфатов. Сравнение гидрогеохимических условий в Восточном Донбассе до и после массовой ликвидации угольных шахт (за 25 лет) выявило значительное ухудшение качества шахтных вод и усиление процессов загрязнения грунтовых и поверхностных вод в регионе. Все изложенное свидетельствует о необходимости проведения реабилитационных мер и о совершенствовании очистных технологий For decades, the coal industry has had an intense negative impact on all environmental components in Eastern Donbass. Mine water is one of the most powerful factors in the transformation of hydrogeochemical conditions. Particularly intense changes in the concentrations of macro components in mine waters have occurred in the last 25 years the field of mass liquidation of coal mines in the region. For all the limited macrocomponents, the MAC exceeded the water supply of householddrinking, cultural, and domestic water use in average concentrations, and for some components even on minimum values. For an average concentration of 20 micronutrients, excess of MAC was found in 53 of components, at a maximum concentration of 73.The average concentrations of a number of elements are ten times higher than the corresponding MAC, and at maximum concentrations the excess is hundreds of times. In groundwater and surface waters there was an increase in average, median and maximum concentrations of macro components by 1.22.0 times. On average concentrations, the excess of MAC was observed for 67, and for the maximum for 83100 of the limited components. For average concentrations of trace elements in groundwater, excess was observed in 40, and for maximum values in 67 of cases. Average concentrations of trace elements exceed MAC several times, maximum concentrations tenfold. After the liquidation of coal mines, there was a sharp increase in the oxidation processes of sulphides and sulfur contained in coals and consumable rocks, and the dissolution of sulfates. Comparison of hydrogeochemical conditions in Eastern Donbass before and after the mass liquidation of coalmines (for 25 years) revealed a significant deterioration in the quality of mine water and increased groundwater pollution processes in the region. All of this demonstrates the need for rehabilitation measures and improvements in treatment technologies

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