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Toxicity assessment of arsenic and cobalt in the presence of aquatic humic substances of different molecular sizes
(2017-05-01)
The release of contaminants in aquatic ecosystems can be influenced by humic acids. In this study, toxicity tests using environmentally relevant concentrations of arsenic and cobalt were conducted both in the presence and ...
Toxicity assessment of arsenic and cobalt in the presence of aquatic humic substances of different molecular sizes
(Elsevier B.V., 2017-05-01)
using environmentally relevant concentrations of arsenic and cobalt were conducted both in the presence and absence of aquatic humic substances (AHS) and the fractions of different molecular sizes in the range of (< 5, ...
Interaction between humic substances and metallic ions: A selectivity study of humic substances and their possible therapeutic application
(2007-09-06)
The complexation capacity of humic substances extracted from peat samples taken from the Mogi River in Ribeirao Preto, SP, Brazil, was determined using metal ions (Al(III), Pb(II), Cr(VI) and Cd(II)), yielding the following ...
Chitosan nanoparticles loaded the herbicide paraquat: The influence of the aquatic humic substances on the colloidal stability and toxicity
(Elsevier B.V., 2015-04-09)
Polymeric nanoparticles have been developed for several applications, among them as carrier system of pesticides. However, few studies have investigated the fate of these materials in the environment in relation to colloidal ...
Persistent toxic substances (PTS) in Brazil
(Soc Brasileira QuimicaSao PauloBrasil, 2007)
Sediment toxicity identification evaluation (TIE phases I and II) based on microscale bioassays for diagnosing causes of toxicity in coastal areas affected by domestic sewage
(2017-07-01)
Domestic sewage is a major problem in highly urbanized coastal areas worldwide. In the present study, toxicity identification evaluation (TIE) phases I and II were applied to sediment interstitial water from 2 locations ...
Substâncias tóxicas persistentes (STP) no BrasilPersistent toxic substance (PTS) in Brazil
(Sociedade Brasileira de Química, 2007)
Peat humic substances enriched with nutrients for agricultural applications: competion between nutrients and non-essential metals present in tropical soils
(Elsevier B.V., 2010-05-15)
Improved agricultural productivity, and reduction of environmental impacts, require studies of the interactions between different soil components. Fertilizers marketed as “organic” or “natural”, such as peats or humic ...
Peat humic substances enriched with nutrients for agricultural applications: Competition between nutrients and non-essential metals present in tropical soils
(2010-05-01)
Improved agricultural productivity, and reduction of environmental impacts, require studies of the interactions between different soil components. Fertilizers marketed as organic or natural , such as peats or humic ...
ACUTE TOXICITY OF HERBICIDES AND SENSIBILITY OF AQUATIC PLANT Wolffia brasiliensis AS A BIOINDICATOR ORGANISM
(Univ Federal Vicosa, 2019-01-01)
This study aimed to establish the mass cultivation of Wolffia brasiliensis under laboratory conditions, determine the sensitivity of reference substances (potassium dichromate, sodium chloride, and potassium chloride), and ...