Wyniki wyszukiwania - Biblioteka Nauki

1

An attempt to evaluate the interaction between sodium silicates of different silicate moduli and selected salts of transition metals

100%

Koźlak W.

|

2008

|

tom Vol. 52, nr 3-4

139-148

EN

Turbidimetric method was employed to study the combinations of water glasses having different silicate moduli and selected salts of transition metal elements. Basing on the character of turbidity curves it was found that colloidal silicates of transition metal elements are formed in the initial phase of the turbidimetric measurement. No increase of turbidity in time is observed. Forming of the silicate depends on the silicate modulus and molecular composition of water glass solutions. This finding is confirmed with the relative sizes of molecules of formed silicates as well as with the values of average radius of their molecules.

2

Comparing the quality of solution of inverse problem in nephelometric and turbidimetric measurements

100%

Szczuczyński D. K. , Mroczka J.

|

2009

|

tom Vol. 39, nr 3

521-531

EN

The paper presents results of the simulation research aiming at comparison of the quality of reconstruction of particle size distribution of dispersed phase in particulate systems by solving the inverse problem for nephelometric measurement data and for turbidimetric measurement data corrupted to a varying extent by random errors. In the case of both measurement techniques mathematical models based on Mie light scattering theory were applied. The results obtained demonstrated that the reconstruction on the basis of turbidimetric measurements is characterized by generally bigger accuracy compared to the reconstruction on the basis of nephelometric measurements. The advanatage of the reconstruction based on turbidimetric measurement data over the reconstruction based on nephelometric measurement data increases significantly in the case of measurement data of both kinds affected by random noise.

3

Badanie stabilności fazowej odsiarczonego gudronu za pomocą turbidymetrii i pomiarów sedymentacji dyspersji

86%

Lorek A. , Paczuski M.

|

2006

|

tom R. 62, nr 9

453-460

PL

W artykule przedstawiono wyniki eksperymentalnych metod określania stabilności dyspersji asfaltenów w odsiarczonym gudronie na podstawie pomiarów rozpraszania światła i sedymentacji fazy stałej. Zastosowano statyczne i skaningowe turbidymetry oraz przeprowadzono wirówkowe i wagowe testy sedymentacyjne. Oceniono wpływ dodatku oleju sklarowanego na stabilność fazową dyspersji asfaltenów.

EN

In the article some results of the experimental method for asphaltene dispersion stability determination by light turbidity and sedimentation tests was described. Static and scanning turbidimeters were applied as well as centrifugal and sedimentation scales. The influence of clarified oil from FCC process on phase stability of asphaltene dispersion in hydrodesulphurized vacuum residue was investigated.

4

An attempt to evaluate the interactions between sodium silicates of different moduli and selected salts of II group elements

72%

Koźlak W.

|

2007

|

tom Vol. 51, nr 1-2

11-28

EN

Using the turbidimetric method based on the formation of a soluble colloidal silicates, the systems containing sodium water glasses having different silicate moduli and selected salts of II group elements were studied. Basing on so called turbidity curves it can be concluded that, with the exception of magnesium sails, practically in all eases the values of turbidity increase in time, especially for the silicates of high si li-cate moduli. The nature of the course of turbidity curves is related to the type of the silicate, i.e. its silicate modulus, molecular composition of aqueous solutions and the type of the salt. Both the type of cation and anion should be taken into account. In the areas of industry and economy where water glasses are used, the value of silicate modulus should be taken into consideration as there arc significant differences in the interactions between II group elements and silicates having high and low silicate modulus.

5

Turbidimetric studies on sodium water glass - cobalt(II) salts systems for the evaluation of the possibility to use silicates for the removal of Co2+ ions from aqueous media

72%

Koźlak W.

|

2008

|

tom Vol. 15, nr 8

743-750

EN

Using the turbidimetric method, based on the formation of water soluble, colloidal silicate, systems containing technical sodium water glasses of different moduli (Mk = 3.24-3.41) and selected cobalt salts were studied. Cobalt silicates are formed in the very initial phase of the measurement and in all systems slight increase of turbidity in time is observed. Significant values of turbidity (100-550 NTU) indicate that water glasses can be used to remove toxic cobalt salts from water ecosystems.

PL

Metodą turbidymetryczną, polegającą na otrzymywaniu rozpuszczalnego, koloidalnego krzemianu, badano układy zawierające różnomodułowe (Mk = 3,24-3,41) techniczne szkła wodne sodowe i wybrane sole kobaltu. Krzemiany kobaltu powstają na samym początku pomiaru. We wszystkich układach obserwuje się nieznaczny wzrost wartości zmętnienia w czasie. Znaczące wartości zmętnień (100-550 NTU) wskazują, że szkła wodne sodowe można wykorzystywać do usuwania toksycznych soli kobaltu z ekosystemów wodnych.

6

Studies on sodium water glass - selected cadmium salts systems for the evaluation of possibility to use sodium silicates for the removal of toxic cadmium salts from aqueous media

72%

Koźlak W.

|

2008

|

tom Vol. 15, nr 7

665-673

EN

By means of the turbidimetric method, based on the formation of soluble colloidal silicate, systems containing sodium water glasses produced by Eka-Chemicals (Sweden) and selected cadmium salts have been studied. Basing on the course of turbidity curves (functions of turbidity [NTU] on time [min]) it can be observed that the formation of colloidal cadmium silicates depend on the type of used salt and the type of water glass characterized by silicate modulus Mk and chemical composition of its aqueous solution. Basing on the chemical reactions of water glasses with cadmium salts the possibilities of their use to remove Cd2+ ions from communal and industrial wastewaters were evaluated.

PL

Metodą turbidymetryczną, polegającą na otrzymywaniu rozpuszczalnego koloidalnego krzemianu, badano układy zawierające szkła wodne sodowe produkcji szwedzkich zakładów Eka-Chemicals oraz wybrane sole kadmu. Z przebiegu krzywych zmętnienia (zależność mętności [NTU] od czasu [min]) wynika, że tworzenie się koloidalnych krzemianów kadmu zależy od rodzaju zastosowanej soli oraz rodzaju szkła wodnego charakteryzowanego przez moduł-krzemfanowy Mk, a zatem i skład chemiczny jego roztworów wodnych. Na podstawie reakcji chemicznych szkieł -'wodnych z solami kadmu dokonano oceny możliwości ich zastosowania do usuwania jonów Cd2+ Z mediów m.in. ze ścieków przemysłowych i komunalnych.

7

Attempt to evaluate the interactions between sodium silicates of different moduli and selected salts of metals(III)

58%

Koźlak W.

|

2007

|

tom Vol. 14, nr 7

733-745

EN

Using the turbidimetric method, based on the formation of water soluble, colloidal silicate, systems containing technical sodium water glasses of different moduli produced in Poland and selected salts of trivalent metals (Cr, Fe, Al, in and Sb) were studied. The nature of the course of turbidity curves is related to the type of silicate, !e its silicate modulus and the type of the salt. It was demonstrated that sodium water glasses can be applied to remove Cr3+, Fe3+and Al3+ ions. In the case of indium and antimony salts proposed method is not usable.

PL

Metodą turbidymetryczną, polegającą na otrzymywaniu rozpuszczalnego, koloidalnego krzemianu, badano układy zawierające różnomodułowe techniczne szkła wodne sodowe produkcji krajowej i wybrane sole pierwiastków metali trójwartościowych (Cr, Fe, Al, In i Sb). Charakter przebiegu krzywych zmętnienia związany jest z rodzajem krzemianu, tj. jego modułem krzemianowym oraz rodzajem zastosowanej soli. Wykazano, że szkła wodne sodowe można wykorzystać do usuwania jonów Cr3+, Fe3+ i A13+ z mediów. W przypadku soli indu i antymonu proponowana metoda ma znikome zastosowanie.