2001
DOI: 10.1590/s1676-24442001000400003
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The determination of total calcium in urine: a comparison between the atomic absorption and the ortho-cresolphtalein complexone methods

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Cited by 7 publications
(4 citation statements)
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“…Creatinine in urine and serum was measured by Jaffe's method with the formation of creatinine-picrate and estimated by spectrophotometry (600 nm wave length) (Jaffe 1886). Calcium in urine and serum was measured by O-cresolphthalein complex method by spectrophotometry (578 nm wave length) (Parentoni et al 2001). Sodium in urine and serum was measured by the formation of uranyl magnesium sodium acetate complex and adding potassium ferrocyanide and estimated by spectrophotometry (550 nm wave length) (Stone & Goldzieher 1949).…”
Section: Analytical Proceduresmentioning
confidence: 99%
“…Creatinine in urine and serum was measured by Jaffe's method with the formation of creatinine-picrate and estimated by spectrophotometry (600 nm wave length) (Jaffe 1886). Calcium in urine and serum was measured by O-cresolphthalein complex method by spectrophotometry (578 nm wave length) (Parentoni et al 2001). Sodium in urine and serum was measured by the formation of uranyl magnesium sodium acetate complex and adding potassium ferrocyanide and estimated by spectrophotometry (550 nm wave length) (Stone & Goldzieher 1949).…”
Section: Analytical Proceduresmentioning
confidence: 99%
“…Prostate indices evaluated in this study were as described for calcium (Parentoni, Pozeti, Figueiredo, & de Faria, 2001), phosphate (Parsons, Dawson, Callahan, & Potts, 1970), PSA (Arneth, 2009) and ACP (Wright et al., 1972a). The pH of the prostatic fluid was determined by dipping the pH cooperative paper strip (British Drug House Chemical Limited, Poole, England; pH 1.0 to 14.0) into the prostate fluid and matching the colour that developed against that of known standards.…”
Section: Methodsmentioning
confidence: 99%
“…Despite meeting the requirements of simplicity, easy implementation, and automation in the analysis of a long series of samples, each of these assays has certain limitations mainly related to the lack of selectivity. For spectrophotometric determination of Ca and Mg, chelating agents such as EDTA, ortho-cresol phthalein or Arsenazo 3 are used; nevertheless, potential interferences must be eliminated by adding masking agents or by the application of multivariate analysis algorithms [4][5][6]. In the case of ionselective electrodes, the test provides quantitative data on free ions ("ionized" Ca, Mg); however, the electrodes have a short lifetime, and the measurement is susceptible to interference from organic compounds and/or other ions present in the sample.…”
Section: Introductionmentioning
confidence: 99%