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1

Surfactants in the River Warta: 1990-2000

100%
Szymanski A., Wyrwas B., Jesiolowska A., Kazmierczak S., Przybysz T., Grodecka J., Lukaszewski Z.
Polish Journal of Environmental Studies
|
2001
|
tom 10
|
nr 5
Data concerning the systematic determination of anionic surfactants (AS) and non-ionic surfactants (NS) over the period 1990-2000 in a single sampling point (Poznan) is reported, as well as data concerning the determination of these surfactants along the whole of the River Warta measured in 1997-1999. The indirect tensammetric method was applied for the determination of non-ionic surfactants, while the MBAS method was applied for the determination of anionic surfactants. The: average concentration of NS over the period 1990-2000 showed a highly increasing tendency, from approximately 25 mug l(-1) to approximately 150 mug l(-1). The average spring-summer concentration of AS over this period fluctuated around the value of 140 mug l(-1), while autumn-winter average concentrations showed a gradual decrease in average concentration over the last five years, from approximately 300 mug l(-1) to approximately 150 mug l(-1).
2

Application of characteristic volumes and topological indices of molecules in toxicity prediction of several anionic surfactants in aquatic environment

86%
Zielinski R.
Towaroznawcze Problemy Jakości. Polskie Towarzystwo Towaroznawcze
|
2018
|
nr 2
3

Influence of amphiphilic anionic and cationic mixture on calcium ion desorption from lipid membranes. I. Experiments with small unilamellar vesicles

86%
Fogt A., Kubica K., Kuczera J.
Polish Journal of Environmental Studies
|
1994
|
tom 03
|
nr 4
This paper studies the influence of equimolar mixtures of biologically-active cationic and anionic amphiphiles (dodecyl-oxymethylene-methyl-morpholinium chloride (DOMM) and one of the series of sodium alkylsulphonates (ASJ with n = 1,2,4,6,8,10,12 and 14 carbon atoms in the alkyl chain) on calcium ion desorption from lecithin liposome membranes. It was shown that by choosing the hydrophobic part of the amphiphilic anion in the mixture one can regulate the efficiency of the amphiphilic cation towards the desorption process. The rate constant of that process strongly depends on the surfactant concentration. The differences in the effectiveness of the different compounds are most distinct at lower concentrations and vanish when the concentration increases. The results are discussed in response to the amphiphilic ion-pair hydrophobicity and their electrical properties. The role of the hypothetical, temporal complexes consisting of the alkylsulphonate anion(s) and calcium cation (ASn-Ca)+ in the calcium ion exchange is discussed. The mechanism of Ca2+ desorption from the surface of the phospholipid bilayer under the simultaneous action of the cationic and anionic detergents is proposed. According to our proposal calcium ion release occurs due to the joint action of the monovalent cationic and anionic detergents in coincidence with a divalent calcium ion. To authenticate the proposed mechanisms of calcium ion release, the shapes of the experimental curves were compared with the theoretical ones obtained by computer simulation using the cellular automata method.
4

Biodegradability of detergent powder surfactants in the river water die-away test

86%
Siwinski P., Szymanski A., Lukaszewski Z.
Polish Journal of Environmental Studies
|
1998
|
tom 07
|
nr 4
A modified river water die-away test is developed for controlling the biodegradability of anionic surfactants (AS) and non-ionic surfactants (NS) of detergent powders. The tested powder undergoes a procedure replicating the washing process. An aliquot of the final solution is introduced into river water exhibiting good biodegradative ability. Primary biodegradation of both types of surfactant is monitored over 20 days and the MBAS method used for determining AS and the indirect tensammetric method for NS. Twelve detergent powders purchased in Polish supermarkets in 1995 are analysed. AS in all tested powders exhibit a relatively fast and complete biodegradation. NS are very diverse in terms of biodegradability: two powders had NS not satisfying the 80% biodegradability limit.
5

Evaluation of phytotoxic effect of wastewater contaminated with anionic surfactants

72%
Liwarska-Bizukojc E., Urbaniak M.
Biotechnologia
|
2007
|
nr 1
203-214
6

Monitoring surfactant concentrations in surface waters in Tricity agglomeration

58%
Pastewski S., Medrzycka K.
Polish Journal of Environmental Studies
|
2003
|
tom 12
|
nr 5
Studies were conducted to determine the concentration of anionic surfactants in selected waters in Tricity agglomeration (Gdańsk, Gdynia, Sopot). Water samples were taken from November 2001 to May 2002. The total concentration of anionic surfactants in the environmental samples was determined by Methylene Blue Active Substances Method (MBAS). The concentration of anionic surfactants in the analyzed waters ranged from 5 to 150 ^g/dm3. The highest surfactant content was observed in the Strzyża stream in Gdańsk and the Kacza river in Gdynia. Less polluted were the Haffner stream in Sopot and the Oliwski stream in Gdańsk.
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