Buscar
Mostrando ítems 101-110 de 432468
Effects of ultrasonic irradiation on the spectrophotometric determination of nickel with dimethylglyoxime
(2001)
Influence of ultrasonic waves in the spectrophotometric determination of nickel with dimethylglyoxime (DMG) was investigated and interferences from foreign species such as Co2+, Fe2+ and Cu2+ were studied. A 1.5-fold ...
Oral health inequities. Factors which determine their reality in Chile
(2016)
Although access to health care is a right in Chile, various surveys and studies show that not all Chileans have equal rates of oral health. The most deprived populations, rural, ethnic minority and older have traditionally ...
Manganese determination by GFAAS in feces and fish feed slurries
(2007-11-21)
This paper presents a simple, fast and sensitive method to determine manganese in samples of feces and fish feed by graphite furnace atomic absorption spectrometry (GFAAS) by the direct introduction of slurries into the ...
Application of the GPS system for preliminary satellite orbit determination
(1997-12-01)
In this paper, we discuss a method of preliminary orbit determination for an artificial satellite based on the navigation message of the GPS constellation. Orbital elements are considered as state variables and a simple ...
The addition of the determiner “a” out of context
(Biblioteca Digital wdg.biblioUniversidad de Guadalajara, 1969-12-31)
This paper explores a syntactical error which was found among Mexican learners of
English belonging to a Technological University: the addition of the determiner “a” out of
context. Specifically, before verbs in simple ...
A new fluorescence method for determination of ozone in ambient air
(Elsevier B.V., 2011-11-01)
A new simple method for determination of ozone in ambient air is presented. The reaction employed is based on the known ozonolysis of indigo dye. The indigotrisulfonate molecule contains one carbon-carbon double bond (C ...
Sequential spectrophotometric determination of chromium(III) and chromium(VI) using flow injection analysis
(1985-12-01)
A flow injection analysis (FIA) procedure for the speciation of Cr(III) and Cr(VI) using the 1,5-diphenylcarbazide (DPC) method is presented. As Cr(III) does not interfere in the Cr(VI) - DPC reaction, both Cr(VI) and total ...
Manganese determination by GFAAS in feces and fish feed slurries
(2007-11-21)
This paper presents a simple, fast and sensitive method to determine manganese in samples of feces and fish feed by graphite furnace atomic absorption spectrometry (GFAAS) by the direct introduction of slurries into the ...
Determination of Mg (II) in biodiesel by adsorptive stripping voltammetry at a mercury film electrode in the presence of sodium thiopentone
(2013-01-01)
A mercury film electrode was used to determine Mg (II) in biodiesel by adsorptive stripping voltammetry in presence of sodium thiopentone. A linear response was obtained for Mg (II) in the concentration range of 6.0 × 10-7 ...