Nature and extent of the interactions of humic acids with a water treatment algicide and a fungicide

Matthews, John C.; Ekuta, Jethro; Drake, K.D.; Watson, Carl F.; Benson, William H.

doi:10.1016/0045-6535(95)00031-3

Cited by 13 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…K D ≈ 20,000-50,000) when sorption to an acid-precipitable fraction of humic acid was investigated (Matthews et al 1995). The results from this work for the polyquaterniums found in cosmetics are comparable to those obtained by Podoll and Irwin (1988) for the tertiary cationic poly(N,N,-dimethylaminoethyl methacrylate) (PDAM) oligomers on sediments (880-4,100 mL g −1 ).…”

Section: Resultssupporting

confidence: 52%

Sorption of Polymeric Quaternary Ammonium Compounds to Humic Acid

Cumming

Hawker

Chapman

et al. 2010

Water Air Soil Pollut

View full text Add to dashboard Cite

Polymeric quaternary ammonium salts or polyquaterniums are used not only in the water and wastewater industry but also in cosmetics. The former have been extensively studied with sorption to wastewater treatment plant (WWTP) biosolids an important factor in their fate, mitigating release to the environment. Compounds of cosmetic origin have not received the same scrutiny as those used in other applications despite differences in their structure, characteristics and properties such as toxicity. In this work, the sorption of selected polyquaterniums found in cosmetics to treated humic acid, employed as a surrogate for WWTP biosolids, is investigated. For comparison, the sorption of poly(diallyldimethylammonium chloride) (poly (DADMAC)), a polyquaternium commonly used as a flocculant, and cetyl pyridinium chloride, a monomeric quaternary ammonium compound, are also determined. The humic acid/water partition coefficients (K D ) of cetyl pyridinium chloride (52,000 Lkg −1 ) and poly (DADMAC) (2,200 Lkg −1 ) were greater than those of the polyquaterniums found in cosmetics (200 to 1,200 Lkg −1 ). Assumptions of partitioning mainly to biosolids and substantial removal relative to the influent concentration of WWTPs may therefore not be valid.

show abstract

Section: Resultssupporting

confidence: 52%

Sorption of Polymeric Quaternary Ammonium Compounds to Humic Acid

Cumming

Hawker

Chapman

et al. 2010

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Humic acids are ubiquitous in natural environments with a typical average molecular weight of 2000 to 3000 Da (Matthews et al 1995) and are effective complexing agents in natural seawater (Weber 1988). In contrast to phyto-DOC and natural DOC, addition of humic acid significantly enhanced the uptake of Hg(II) by the mussels.…”

Section: Mercury Uptake Influenced By Total Dissolved Organic Carbonmentioning

confidence: 99%

Uptake of Hg(II) and methylmercury by the green mussel Perna viridis under different organic carbon conditions

Pan¹,

Wang²

2004

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

The bioavailability and toxicity of mercury to aquatic organisms are greatly dependent on its chemical species, such as inorganic and methylated mercury. We examined the influences of various physico-chemical parameters [metal concentration, salinity, dissolved organic carbon (DOC) and colloidal organic carbon (COC) on the bioavailability of inorganic mercury (Hg(II)] and monomethylmercury (MeHg) to the green mussel Perna viridis. The uptake rate constant of MeHg was about 8.5x higher than that of Hg(II). The uptake increased by 75% for Hg(II) and 117% for MeHg with decreasing salinity from 30 psu to 15 psu. Biogenic DOC derived from diatom decomposition decreased the uptake of Hg(II), consistent with the results of DOC originating from natural seawater. In contrast, the uptake of Hg(II) was enhanced considerably in the presence of humic acid. The bioavailability of MeHg was only weakly influenced by differences in DOC quality or quantity, but it was significantly decreased by estuarine DOC. The influence of COC on Hg bioavailability was also dependent on the colloidal structural properties and the colloid-metal complexation. Binding with colloidal nanoparticles increased the uptake of Hg(II) by 3.3 to 7.3 times compared to low molecular weight-complexed Hg, but decreased the uptake of MeHg by 42 to 73%. For both Hg(II) and MeHg, the uptake of the 9 d aged radiolabeled metals was lower than the uptake of the 2 d aged radiolabeled forms. Our study suggests that various mechanisms, such as facilitated transport and direct colloidal ingestion, are involved in the uptake of Hg(II) and MeHg under different dissolved and colloidal organic carbon conditions. COC and DOC need to be separately considered, given their different influences on mercury uptake. KEY WORDS: Mercury · Methylmercury · Dissolved organic carbon · Colloidal organic carbon · InfluxResale or republication not permitted without written consent of the publisher

show abstract

“…Among them, humic acid (HA) is the fraction of HS that is not soluble in water under acidic conditions (< pH 2), but is soluble at higher pH, with typical average molecular weight of 2,000 to 3,000 [13]. HS have a relatively high content of radicals, presumably of the semiquinone type, which are more prominent in HA than the other components.…”

Section: Introductionmentioning

confidence: 99%

“…The HS in aquatic ecosystems have been shown to be important in influencing the bioavailability, toxicity and fate of organic xenobiotics [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Humic Acid on 1-Aminopyrene Ecotoxicity During Solar Photolysis Process

Balarezo

Jones

et al. 2002

IJMS

View full text Add to dashboard Cite

1-Aminopyrene (1-AP), a polycyclic aromatic hydrocarbons (PAH) compound, is a major metabolite during biotransformation of 1-nitropyrene by microflora in natural environment and in the guts of animals and humans. Under UV-A irradiation, 1-AP has been shown to cause light-induced DNA single strand cleavage. Humic acids (HA) in aquatic ecosystems can influence the bioavailability, toxicity, and fate of organic xenobiotics. Therefore, photochemical fate and effect of PAH in natural aquatic environment may differ significantly across sites. The objectives of this study are to assess the time course (TC; 18 and 90 minutes) influence of HA (0, 20, and 60 ppm) on microbial ecotoxicity of 1-AP (0 and 10 µM) during solar photolysis process (PP). Microbial ecotoxicity of 1-AP during different time courses in the presence and absence of HA was measured with spread plate counting and microbial mineralization of 14 C-D-glucose. The experimental results were analyzed as factorial arrangements of treatment in a complete randomized design using General Linear Model by SAS. LSMEANS was used to separate means or combination of means. Significant effect on glucose mineralization was found by the following treatment interactions 1-AP*TC, 1-AP*PP, TC*PP, HA*1-AP*TC, HA*1-AP*PP, and HA*1-AP*TC*PP. The treatment interaction HA*1-AP was the only one affecting spread plate counting. In the groups exposed to 1-AP (10 µM), microbial heterotrophic mineralization of 14 C-D-glucose was significantly inhibited in the presence of HA in light and in darkness. Exposure to HA in light and darkness, however, did not necessarily inhibit bacterial viability at the HA concentration range assayed. Therefore, inhibition on microbial activity could have been caused by multiple factors, instead of toxicity of HA alone.

show abstract

Nature and extent of the interactions of humic acids with a water treatment algicide and a fungicide

Cited by 13 publications

References 12 publications

Sorption of Polymeric Quaternary Ammonium Compounds to Humic Acid

Sorption of Polymeric Quaternary Ammonium Compounds to Humic Acid

Uptake of Hg(II) and methylmercury by the green mussel Perna viridis under different organic carbon conditions

Influence of Humic Acid on 1-Aminopyrene Ecotoxicity During Solar Photolysis Process

Contact Info

Product

Resources

About