Wyniki wyszukiwania

1

Assessment of toxic interaction of metals in binary mixtures using Lepidium sativum and Spirodela polyrrhiza

100%

Montvydiene D., Marciulioniene D.

Polish Journal of Environmental Studies

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2007

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tom 16

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nr 5

777-783

The toxicity of CuS0^5H20, K£r2O7, ZnS0^7H20, and Ni(N03)2 and their binary mixtures on L. sativum and S. polyrrhiza was determined. The type of toxic interaction at each tested metal combination was evaluated by a statistical approach on testing the null hypothesis of "additive toxicity" at p<0.05. The effects were defined as antagonistic, additive, or synergistic, in accordance with the sign of difference between the tested hypothesis and the value of the observed toxicity at tested combinations. In the majority of metal combinations, the interactions for L. sativum were of antagonistic nature (94%), and only 6% of additive. The 100% additive interactive effects were found in the metal mixtures for S. polyrrhiza. The antagonistic or additive interactive effects found in almost all metal ion mixture combinations confirms the presumption that the interaction between ions can be caused by competition for the same reaction center on cell membranes if these ions belong to the same group of Lewis acids.

2

Functional formalism for equations of Oberbeck-Boussinesq type of the developed thermohaline turbulence

100%

Icha A.

Oceanologia

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1985

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tom 20

3

The removal of reactive dyes from binary mixtures using chitin

84%

Filipkowska U., Klimiuk E., Kuczajowska-Zadrozna M., Kus S.

Polish Journal of Environmental Studies

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2004

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tom 13

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nr 6

The adsorption of reactive dye mixtures onto chitin modified with 5N KOH was investigated. Three binary mixtures were tested. Each mixture contained Blue D-5RN and either Yellow D-5GN, or Red D-8B or Black DN as the second dye. The tests were conducted without pH adjustment and after pH adjustment to 3.0. The results were based on the constants determined from double Langmuir isotherm. The maximum adsorption capacity of Blue D-5RN (control sample) in the samples without pH adjustment accounted for 97 mg/g d.w., and in the sample with pH adjustment (pH=3) – for 205 mg/g d.w. The adsorption capacity of a mixture of Red D-8B and Blue D-5RN reached 93 and 196 mg/g d.w., respectively, and in a mixture containing Yellow D-5GN – 103 and 214 mg/g d.w., respectively. The dye competition in a mixture was evaluated comparing 7 constants in Langmuir equation for mixtures and Blue D-5RN in a mixture. The adsorption capacity of Blue D-5RN in a mixture was found to be by ca. 8.8 % lower than the adsorption capacity of a dye mixture in the samples without pH adjustment and by ca. 9.4 % lower compared to the samples with adjusted pH. An explicit decline in K1 value was also observed, depending on the type of the second dye and pH. Blue D-5RN and Red D-8B characterized by a high similarity of chemical structure competed for active sites more strongly. It was confirmed by a higher (ca. 9-fold and 2.1-fold -pH=3) decrease in constants K determined for Blue D-5RN in a mixture. The experimental data showed that in the samples with pH=3, the competition for active sites between dyes was weaker.

Ograniczanie wyników

2 Polish Journal of Environmental Studies

1 Oceanologia

1 Filipkowska U.

1 Icha A.

1 Klimiuk E.

1 Kuczajowska-Zadrozna M.

1 Kus S.

1 Marciulioniene D.

1 Montvydiene D.

1 2007

1 2004

1 1985

Assessment of toxic interaction of metals in binary mixtures using Lepidium sativum and Spirodela polyrrhiza

Functional formalism for equations of Oberbeck-Boussinesq type of the developed thermohaline turbulence

The removal of reactive dyes from binary mixtures using chitin