in this work, a new, simple and fast method for the solid phase extraction-spectrophotometric determination of phosphate using cetyltrimethyl ammonium bromide immobilized on alumina-coated magnetite nanoparticles (ctab@acmnps) has been developed. the determination of phosphate is based on the molybdenum blue method which was monitored at λmax of 810 nm. mnps and acmnps characterized by sem, vsm...

the reduction mechanism of molybdenum-methyl thymol blue (mtb)-chlorate system has been investigated in water on a mercury electrode. as this system is very sensitive for ultratrace determination of molybdenum, the actual mechanism involved was studied. electrochemical techniques, including dc tast polarography and cyclic voltammetry were employed. it is shown that, the cathodic wave of molybde...

To the Editor: We read with interest a paper on phospholipid analysis in this journal (1) but deferred comment until the publication of our own paper on the subject, which we believe contains relevant material (2). Sandhu refers to the formation of a Prussian blue complex as the result of a reaction between phospholipids and a chromogenic reagent containing molybdenum. Clearly this cannot be so...

The reduction mechanism of molybdenum-methyl thymol blue (MTB)-chlorate system has been investigated in water on a mercury electrode. As this system is very sensitive for ultratrace determination of molybdenum, the actual mechanism involved was studied. Electrochemical techniques, including dc tast polarography and cyclic voltammetry were employed. It is shown that, the cathodic wave of mol...

During the past decade there has been an increasing interest shown in the study of electrolyte balance. Magnesium, however, has played a minor r81e in these studies. There are perhaps two reasons for this; first, that serum magnesium levels remain fairly constant and, second, that magnesium determinations require special technique and equipment and are time-consuming procedures as well. There h...

Silicon may be determined in solution by the spectrophotometric method of Dienert & Wandenbulche (1923), as modified by King & Stantial (1933). This involves the formation of the yellow silicomolybdate and the reduction of this complex to molybdenum blue by 1-amino-2-naphthol-4sulphonic acid reagent. Measurement of this colour provides a means of determining silicon. A disadvantage of this meth...

Carbon monoxide:methylene blue oxidoreductase, the key enzyme of CO-oxidation in energy metabolism of the carboxydobacterium Pseudomonas carboxydovorans, has been isolated in good yield and purity and found to contain FAD, molybdenum, iron, and labile sulfide in the ratio of 1:1:4:4. The enzyme is, therefore, a new molybdenum-containing iron-sulfur flavoprotein, exhibiting chemical and spectral...

Molybdenum is very toxic to agricultural animals. Mo-reducing bacterium can be used to immobilize soluble molybdenum to insoluble forms, reducing its toxicity in the process. In this work the isolation of a novel molybdate-reducing Gram positive bacterium tentatively identified as Bacillus sp. strain A.rzi from a metal-contaminated soil is reported. The cellular reduction of molybdate to molybd...