An automatic titration setup for the chemiluminometric determination of the copper complexation capacity in opaque solutions

Titration of sulphates with lead perchlorate employing lead ion selective electrode indication was studied using additions of various organic solvents at different pH' and ionic strength values. As the optimum emerged systems with 60-70% 1,4-dioxane, pH' 5.3-5.6. After dehydration with sodium hydroxide, dioxane must be freed from the electrode surface-oxidizing impurities by their reduction with sodium metal and subsequent distillation. The method was applied to determination of sulphates in mountain spring waters. Units of ppm can be determined; the limit of determination, however, depends considerably on the content of dioxane, total salt content in the sample, and speed of the semi-automatic titration. Lead can be determined with EDTA in concentrations down to c(Pb2+) = 5 . 10-6 mol l-1.

Download Full-text

Copper Toxicity to Larval Stages of Three Marine Invertebrates and Copper Complexation Capacity in San Diego Bay, California

Environmental Science & Technology ◽

10.1021/es040545j ◽

2005 ◽

Vol 39 (6) ◽

pp. 1542-1546 ◽

Cited By ~ 38

Author(s):

Ignacio Rivera-Duarte ◽

Gunther Rosen ◽

David Lapota ◽

David B. Chadwick ◽

Lora Kear-Padilla ◽

...

Keyword(s):

San Diego ◽

Marine Invertebrates ◽

Copper Toxicity ◽

Complexation Capacity ◽

Larval Stages ◽

Copper Complexation ◽

San Diego Bay

Download Full-text

The determination of calcium and magnesium in waters by automatic titration

The Analyst ◽

10.1039/an9608500027 ◽

1960 ◽

Vol 85 (1006) ◽

pp. 27 ◽

Cited By ~ 12

Author(s):

J. Haslam ◽

D. C. M. Squirrell ◽

I. G. Blackwell

Keyword(s):

Calcium And Magnesium ◽

Automatic Titration

Download Full-text

Interlaboratory comparability of copper complexation capacity determination in natural waters

Journal of Environmental Monitoring ◽

10.1039/b108103a ◽

2001 ◽

Vol 4 (1) ◽

pp. 116-120 ◽

Cited By ~ 11

Author(s):

Eleanor van Veen ◽

Sean Comber ◽

Michael Gardner

Keyword(s):

Natural Waters ◽

Complexation Capacity ◽

Copper Complexation ◽

Capacity Determination

Download Full-text

Determination of the aluminium complexing capacity of fulvic acids and natural waters, with examples from five New Zealand rivers

Marine and Freshwater Research ◽

10.1071/mf9960011 ◽

1996 ◽

Vol 47 (1) ◽

pp. 11 ◽

Cited By ~ 12

Author(s):

DJ Hawke ◽

KJ Powell ◽

JE Gregor

Keyword(s):

Reaction Time ◽

Natural Waters ◽

Fulvic Acids ◽

Operational Definition ◽

Experimental Conditions ◽

River Waters ◽

Complexation Capacity ◽

Complexing Capacity ◽

Definition Of

An FIA technique with 7 s reaction time was used to analyse free plus labile Al in fulvic acid (FA) solutions and natural waters at pH 4.7, without the need for separation procedures. Titrations of these solutions using incremental pH or total Al were used to determine pH binding curves or estimates of the 'kinetic' Al complexation capacity (Al-CCk) respectively. The operational definition of Al-CCk relates to the capacity of a humic substance or natural water to bind Al through a 7-s FIA reaction time under defined experimental conditions of chromophore (CAS) concentration, ionic strength, and pH. Both Al binding strength and complexation capacity were greater than the corresponding Cu-CC (ISE) values. The Al-CCk measurements at pH 4.7 were 710 μmol Al g-1 v. 590 μmol Cu g-1. Al-CCk results (pH 4.7) were higher for soil FA (710 μmol g-1) than for aquatic FA (390 μmol g-1). Al-CCk results (pH 4.7) for five unfiltered river waters from different catchments gave results in the range 6.5-9.8 μmol Al L-1. The differences between total (natural) Al in the samples and Al-CCk were between 2.7 μM and 8.6 μM. Filtration experiments identified fractionation patterns between total (natural) Al and the fraction of Al-CCk not utilized. The Al titration of alginate, another component of natural organic matter, is reported.

Download Full-text

Determination of Intracellular Magnesium by an Automatic Titration Procedure

Clinical Chemistry ◽

10.1093/clinchem/6.6.564 ◽

1960 ◽

Vol 6 (6) ◽

pp. 564-571 ◽

Cited By ~ 3

Author(s):

Donald A Sones ◽

Warren F McGuckin ◽

Khalil G Wakim

Keyword(s):

Magnesium Concentration ◽

Normal Range ◽

Intracellular Magnesium ◽

Titration Procedure ◽

Term Administration ◽

Original Procedure ◽

Increase In Accuracy ◽

Automatic Titration

Abstract Our experiences with the automatic titration method of quantitating serum calcium and magnesium are presented. In addition, modifications of the original procedure to allow determination of intraerythrocyte concentrations of magnesium are described. It appears that adoption of a separate magnesium standard in addition to the calcium standard, plus certain other minor modifications designed to minimize the variables inherent in the procedure, provides a significant increase in accuracy and reproducibility of results. Values for intraerythrocyte magnesium concentration in 9 normal dogs were found to range from 4.69 to 5.77 mg./100 ml. Values for 4 dogs that received long-term administration of chlorothiazide also fell within this normal range.

Download Full-text