Interference of mercury(II) in the colorimetric determination of inorganic phosphate in water

The Analyst ◽  
1975 ◽  
Vol 100 (1190) ◽  
pp. 322 ◽  
Author(s):  
R. W. Tillman ◽  
J. K. Syers
Keyword(s):  
Inorganic Phosphate ◽  
Colorimetric Determination

Interference of phenothiazine compounds in the colorimetric determination of inorganic phosphate

1972 ◽  
Vol 47 (2) ◽  
pp. 329-336 ◽  
Author(s):  
Hamza F.A. El-Dorry ◽  
Heitor Medina ◽  
Metry Bacila
Keyword(s):  
Inorganic Phosphate ◽  
Colorimetric Determination

scholarly journals A colorimetric determination of inositol monophosphates as an assay for d-glucose 6-phosphate–1l-myoinositol 1-phosphate cyclase

1970 ◽  
Vol 119 (2) ◽  
pp. 183-186 ◽  
Author(s):  
J. E. G. Barnett ◽  
R. E. Brice ◽  
D. L. Corina
Keyword(s):  
Inorganic Phosphate ◽  
Periodic Acid ◽  
Competitive Inhibitor ◽  
Phosphate Esters ◽  
Colorimetric Determination ◽  
Radiochemical Method ◽  
Chemical Assay

A rapid and convenient chemical assay for the enzyme d-glucose 6-phosphate–1l-myoinositol 1-phosphate cyclase is described. The 1l-myoinositol 1-phosphate formed enzymically was oxidized with periodic acid liberating inorganic phosphate, which was assayed. myoInositol 2-phosphate can be assayed in the same way. Glucose 6-phosphate and other primary phosphate esters gave only very small quantities of inorganic phosphate under the conditions described. The Km of the enzyme for d-glucose 6-phosphate, 7.5±2.5×10−4m, was identical with that measured by the radiochemical method. 2-Deoxy-d-glucose 6-phosphate was a powerful competitive inhibitor, Ki 2.0±0.5×10−5m, but was not a substrate for the enzyme.

Colorimetric Determination of Inorganic Phosphate in Microgram Quantities

1951 ◽  
Vol 23 (10) ◽  
pp. 1500-1501 ◽  
Author(s):  
Morris Rockstein ◽  
Paul Herron
Keyword(s):  
Inorganic Phosphate ◽  
Colorimetric Determination

scholarly journals Evaluation of a Kit for the Colorimetric Determination of Inorganic Phosphate

1978 ◽  
Vol 15 (1-6) ◽  
pp. 261-264 ◽  
Author(s):  
C. G. Fraser ◽  
M. J. Peake
Keyword(s):  
Inorganic Phosphate ◽  
Good Accuracy ◽  
Test Method ◽  
Colorimetric Determination ◽  
Accuracy Comparison ◽  
Quality Control Materials ◽  
Reference Serum ◽  
Comparison Of The Results ◽  
Continuous Flow Method

An evaluation of a colorimetric kit method for the determination of inorganic phosphate (Pierce Phosphorus Auto/Stat Kit) is described. The within-batch and between-batch precisions were shown to fulfil current criteria, and recovery experiments, linearity studies, analyses of quality control materials, and studies of possible interfering substances evidenced good accuracy. Comparison of the results obtained on samples from patients with those obtained by the vanadate/molybdate continuous-flow method showed that the test method had a comparative positive bias. The use of a calibration reference serum as standard is recommended. The kit method is technically simple, requiring no protein precipitation, and analyses can be performed rapidly.

A Method for the Colorimetric Determination of β-Glucuronidase in Urine, Serum, Tissue; Assay of Enzymatic Activity in Health and Disease

1959 ◽  
Vol 36 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Julius A. Goldbarg ◽  
Esteban P. Pineda ◽  
Benjamin M. Banks ◽  
Alexander M. Rutenburg
Keyword(s):  
Enzymatic Activity ◽  
Colorimetric Determination ◽  
Health And Disease ◽  
Urine Serum

Colorimetric Determination of Fluoride in Drinking Groundwater using a Polymeric Zirconium Complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline

2013 ◽  
Vol 12 (7) ◽  
pp. 460-465
Author(s):  
Sameer Amereih ◽  
Zaher Barghouthi ◽  
Lamees Majjiad
Keyword(s):  
Drinking Water ◽  
Detection Limit ◽  
Complex Formation ◽  
Molar Absorptivity ◽  
Colorimetric Determination ◽  
Zirconium Complex ◽  
Reliable Determination ◽  
Percentage Recovery ◽  
Quantitation Limit

A sensitive colorimetric determination of fluoride in drinking water has been developed using a polymeric zirconium complex of 5-(2-Carboxyphenylazo)-8-Hydroxyquinoline as fluoride reagents. The method allowed a reliable determination of fluoride in range of (0.0-1.5) mg L-1. The molar absorptivity of the complex formation is 7695 ± 27 L mol-1 cm-1 at 460 nm. The sensitivity, detection limit, quantitation limit, and percentage recovery for 1.0 mg L-1 fluoride for the proposed method were found to be 0.353 ± 0.013 μg mL-1, 0.1 mg L-1, 0.3 mg L-1, and 101.7 ± 4.1, respectively.

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