scholarly journals Effects of heavy metal concentrations on biological activity of soil micro-organisms

2011 ◽  
Vol 49 (No. 7) ◽  
pp. 321-326 ◽  
Author(s):  
M. Šmejkalová ◽  
O. Mikanová ◽  
L. Borůvka
Keyword(s):  
Heavy Metal ◽  
Microbial Activity ◽  
Soil Microbial Activity ◽  
Soil Microflora ◽  
Significant Inhibition ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Soil Microbial ◽  
Cadmium Lead ◽  
Micro Organisms

The distribution of cadmium, lead and zinc in exchangeable, organic, and 2M HNO3-extractable fractions as well as the effect of heavy metal concentrations on soil microflora was investigated. Six sampling transects were chosen in theLitavkaRiveralluvium in 1999–2001. Concentrations of all metals increased with decreasing distance from the source of contamination. The concentrations of Cd and Zn in exchangeable fraction were higher than in organically bound fraction, a reverse trend was found in Pb speciation. All measured parameters of soil microbial activity were affected by heavy metal concentrations. The decrease in CFU was most significant in the case of oligotrophic bacteria and spore-forming bacteria. Significant inhibition of C-biomass occurred in soils highly contaminated by heavy metals. The Cbiomass:Cox ratio decreased with increasing soil pollution. Generally, the values of enzymatic activities were highest in the soil above the source of contamination and they were decreased as approaching the source of contamination. Our results demonstrate that several parameters of microbial activity could be used as good indicators of increasing concentrations of Cd, Pb, and Zn in soil.

scholarly journals Associations between urinary heavy metal concentrations and blood pressure in residents of Asian countries

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Yuki Mizuno ◽  
Hana Shimizu-Furusawa ◽  
Shoko Konishi ◽  
Tsukasa Inaoka ◽  
Sk Akhtar Ahmad ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Blood Pressure ◽  
Heavy Metal ◽  
Individual Characteristics ◽  
Linear Regression Models ◽  
Asian Countries ◽  
Cross Sectional ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Cadmium Lead

Abstract Background Previous studies have suggested that exposures to heavy metals (arsenic, cadmium, lead, and selenium) may be associated with differences in blood pressure. However, the findings of these studies have been inconsistent. This study was performed to examine the associations between urinary heavy metal concentrations and blood pressure among residents of four Asian countries (Bangladesh, Indonesia, Nepal, and Vietnam). Methods This cross-sectional study examined 1899 adults in four Asian countries. Urinary concentrations of heavy metals were measured by inductively coupled plasma mass spectrometry. A questionnaire survey was administered regarding individual characteristics. Anthropometric measurements (height and weight) were performed. Systolic and diastolic blood pressures were measured after a short rest. Multiple linear regression models were applied to investigate associations between urinary heavy metal concentrations and blood pressure after adjustments for age, sex, and body mass index. Results The geometric means of the urinary concentrations of arsenic, cadmium, lead, and selenium were 84.6, 0.885, 2.09, and 16.5 μg/g creatinine, respectively. The urinary arsenic concentrations were slightly higher than those typically reported in non-polluted populations, while urinary cadmium, lead, and selenium concentrations were equivalent or slightly lower. The urinary lead concentrations were positively associated with both systolic and diastolic blood pressure, but urinary selenium concentrations were negatively associated with them. Conclusions Variations in the urinary concentrations of lead and selenium were associated with blood pressure at low levels of exposure/intake.

Impacts of Land-applying Class B Municipal Biosolids on Soil Microbial Activity and Soil Nutrient and Metal Concentrations

2010 ◽  
Vol 2010 (4) ◽  
pp. 1390-1414
Author(s):  
Virginia L. Jin ◽  
Erin M. Witherington ◽  
Mari-Vaughn V. Johnson ◽  
Richard L. Haney ◽  
J. G. Arnold
Keyword(s):  
Microbial Activity ◽  
Soil Nutrient ◽  
Soil Microbial Activity ◽  
Metal Concentrations ◽  
Soil Microbial ◽  
Class B ◽  
Municipal Biosolids

scholarly journals Soil microbial activity under conventional and organic production of bean and maize

2016 ◽  
pp. 35-43
Author(s):  
Jelena Marinkovic ◽  
Ivan Susnica ◽  
Dragana Bjelic ◽  
Branislava Tintor ◽  
Mirjana Vasic
Keyword(s):  
Microbial Activity ◽  
Farming System ◽  
Soil Microbial Activity ◽  
Organic Production ◽  
Soil Microbial ◽  
Number Of Microorganisms ◽  
Microbiological Parameters ◽  
Set Up ◽  
Organic Farming System ◽  
Micro Organisms

The objective of this study was to compare the effects of conventional and organic production system on microbial activity in the soil cultivated with bean and maize crops. The trial in Djurdjevo was set up according to the conventional farming system, while organic farming system was used in Futog. Two maize hybrids and two bean cultivars were used in the trial. Soil samples were collected in two periods during 2014 (before sowing, at flowering stage of bean crops, and at 9-11 leaf stage of maize) at two depths, at both locations. The following microbiological parameters were tested: the total number of micro?organisms, number of ammonifiers, Azotobacter sp., free nitrogen fixing bacteria, fungi, actinomycetes, and activity of dehydrogenase enzyme. The results showed that the total number of microorganisms, number of free N-fixers and dehydrogenase activity were higher within organic production, while Azotobacter sp. was more abundant in conventional production. Variations in the number of ammonifiers, fungi and actinomycetes in relation to the type of production were not obtained. Significant differences in microbial activity were also obtained between period and depths of sampling.

Enhancing Cleanup of Heavy Metal Polluted Landfill Soils and Improving Soil Microbial Activity Using Green Technology with Ferrous Sulfate

2016 ◽  
Vol 6 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Gilbert C. Sigua ◽  
Arnel Celestino ◽  
Ronaldo T. Alberto ◽  
Annie Melinda Paz-Alberto ◽  
Kenneth C. Stone
Keyword(s):  
Heavy Metal ◽  
Microbial Activity ◽  
Ferrous Sulfate ◽  
Soil Microbial Activity ◽  
Green Technology ◽  
Soil Microbial
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