Method For Determination Of Silver Research Articles

Flow Injection Spectrophotometric Determination of Sub-mg dm-3 Silver(I) in a Strongly Acidic Solution Containing Concentrated Copper(II) Using a Pyridylazo Reagent

A novel spectrophotometric flow injection method for determination of silver(I) in a strongly acidic solution containing concentrated copper(II) was developed using a coloring ligand, 4-(3,5-dibromo-2-pyridylazo)-N-ethyl-N-(3-sulfopropyl)aniline (3,5-diBr-PAESA). The method was first investigated by batch method. The interference from copper(II) chelate could be eliminated by the masking effect of EDTA. By utilizing the large formation constant (K = 12.3) of AgBr, one could determine silver(I) as a decrease of absorption by silver(I) chelate due to formation of AgBr by addition of KBr. Based on the results of batch experiments, two types of flow injection analysis (FIA) systems were constructed. Sub-mg dm(-3) determination of silver(I) was attained without interference from excess copper(II). The proposed method was successfully applied to determination of silver in a copper plating solution used in a plant to manufacture copper printed circuit boards, where the concentration of silver was critically important in the process control.

Purification of denatured bovine serum albumin coated CdTe quantum dots for sensitive detection of silver(I) ions

CdTe quantum dots (QDs) were synthesized in aqueous solution with 3-mercaptopropionic acid as the stabilizer. Chemically reduced bovine serum albumin (BSA) was used to modify the surface of the QDs. Experimental results showed that the denatured BSA (dBSA) could be effectively conjugated to the surface of CdTe QDs. Column chromatography was used to purify the conjugates and determine the optimal ratio of dBSA to QDs. Further experimental results showed that the conjugation of QDs by dBSA efficiently improved the photoluminescence quantum yield, the chemical stability of QDs and their stability against photobleaching. A facile and sensitive method for determination of silver(I) ions was proposed based on the fluorescence quenching of the dBSA-QDs. Under the optimal conditions, the relative fluorescence intensity decreased linearly with the concentration of the silver(I) ions in the range 0.08-10.66 microM. The detection limit was 0.01 microM. This study provides a new method for the detection of metal cations.

Method for the rapid atomic-absorption determination of silver in solid carboniferous samples

It is shown that carboniferous samples can be analyzed by injecting them directly into an electrothermal atomizer of an atomic absorption spectrometer as an aqueous suspension stabilized by a surface-active substance. The main factors affecting the stability of the suspension and the metrological characteristics of the procedure are considered; methods for their estimation and approaches to the optimization of the analysis conditions are proposed. A rapid procedure for the determination of silver in carboniferous samples is developed that reduces the time of analysis by several times.

The simultaneous determination of gold and silver in blister copper and speiss products

A method for determination of silver and gold (concentration ranges of 0.1–0.4% and 8·10−4−3·10−3% respectively) in blister copper and speiss is described. Silver is determined directly in the solution after dissolution of the sample and appropriate dilution. The amount of gold is determined in an aliquot of the same solution after extraction with methyl isobutyl ketone. The relative standard deviation of the method described is 3.3% for speiss and 4.4% for blister copper for gold and 1.6% and 2.5% for silver respectively.

Fluorometric reaction rate method for determination of silver

Fluorometric reaction rate method for determination of silver

A chemical catalytic method for determination of silver in human saliva

A catalytic method for the determination of silver in saliva is suggested. Silver was determined by a very simple technique in concentrations in saliva higher than 1 μg/100 ml with a coefficient of variation of 5.7 per cent. The method was used to investigate the correlation between some pathogalvanic phenomena connected with the presence of amalgam restorations in the oral cavity and the concentration of silver in saliva. The application of the method showed no correlation between the number of restorations and the silver concentration in saliva. The joint effects of restorations, their corrosion potential and the concentration of silver in saliva were correlated with the occurrence of unpleasant sensations in the mouth.

Neutron activation determination of silver in rocks and minerals using organic sulfide extraction for silver separation

A rapid method for determination of silver in rocks and minerals by neutron activation was developed. The method is based on the quantitative and selective separation of silver by organic sulfide extraction.

Method for the iodometric determination of silver based upon the reducing action of potassium arsenite

Method for the iodometric determination of silver based upon the reducing action of potassium arsenite