Synchronous Determination of Copper, Iron, Nickel, Lead, Cadmium and Chromium in Electroplating Wastewater by ICP-AES

2014 ◽  
Vol 1033-1034 ◽  
pp. 558-562 ◽  
Author(s):  
Wei Qu ◽  
Cheng Ying Zhou ◽  
Shuang Liu
Keyword(s):  
Detection Limit ◽  
High Ratio ◽  
Spectral Lines ◽  
National Standard ◽  
Electroplating Wastewater ◽  
Relative Standard ◽  
Iron Nickel ◽  
Nickel Lead ◽  
Determination Of Copper

A method was proposed for the determination of copper, iron, nickel, lead, cadmium and chromium in electroplating wastewater by ICP-AES. Working conditions and selection of spectral lines were optimized. The mixed and single standard for 6 elements were analyzed, spectrum with high sensitivity, low spectral interference, high ratio of signal with background, low detection limit were selected. The detection limit was 0.002, 0.003, 0002, 0.008, 0.002, 0.007mg/L. The effects of inhalation rate and the spectral intensity in nitric acid, hydrochloric acid, perchloric acid and sulfuric acid solution were tested. Nitrate acid with low viscosity, low surface tension and high atomization efficiency was selected. The accuracy and precision were tested, the relative error was less than 5.2%, relative standard deviation was less than 2.4%.It was accord with national standard. It proved that the determination of copper, iron, nickel, lead, cadmium and chromium in electroplating wastewater by ICP-AES was feasible.

Determination of the Content of Fluorine and Chlorine in Inorganic Insulation Materials by Ion Chromatography

2018 ◽  
Vol 768 ◽  
pp. 41-45
Author(s):  
Shi Hua Liu ◽  
Qing Dan Yuan ◽  
Peng Chen ◽  
Xuan Li ◽  
Di Shao
Keyword(s):  
Detection Limit ◽  
Thermal Insulation ◽  
Ion Chromatography ◽  
Absolute Error ◽  
Mineral Wool ◽  
National Standard ◽  
Anion Exchange Column ◽  
Insulation Materials ◽  
Relative Standard

A fast and accurate method for simultaneous determination of the content of fluorine and chlorine in inorganic thermal insulation materials by ion chromatography was developed. The samples were cut into pieces of weight less than 40mg, washed with water as the extractant, heated for 30 min and then centrifuged, filtered through a 0.22 μm microporous membrane, and the cation was removed using a SEP-H column. The solution was rinsed with 20/30 mM KOH as the mobile phase, separated by anion exchange column and then detected using a conductivity detector. The mass concentration of fluorine and chlorine in the range of 0.1-10mg/L was linearly related to their peak area, the detection limit of fluorine was 0.030mg/Land the detection limit of chlorine was 0.016mg/L. The relative standard deviations (n=6) of the three typical inorganic insulating materials (glass wool, rock wool and mineral wool) were less than 2.0% and the rate of recovery of fluoride and chloride ion was between 97% and 101%.The method had good accuracy and recovery rate. The absolute error of the measured value between ion chromatography and the national standard was less than 0.20%.The results showed that the method was suitable for the determination of the content of fluorine and chlorine in inorganic thermal insulation materials

Determination of ZrO2 and TiO2 in Alkali-Resistant Fiberglass Mesh by ICP OES

2017 ◽  
Vol 726 ◽  
pp. 65-69
Author(s):  
Qing Dan Yuan ◽  
Lin Cong ◽  
Peng Chen ◽  
Shi Hua Liu ◽  
Qian Nan Li
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Standard Method ◽  
Spectral Lines ◽  
Icp Oes ◽  
Fast Analysis ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Two Samples

The content of ZrO2 and TiO2 in alkali-resistant fiberglass mesh was determined by ICP OES. The sample was pretreated by acid-soluble and alkali-fusion methods. Compared with the results of standard method, the results showed that the method can be used for the determination of ZrO2 and TiO2 in alkali-resistant fiberglass mesh. Standard solutions were prepared based on the content of elements. The best analysis of spectral lines was determined for each element. Blank solution was prepared and injected ten times continuously. The corresponding concentration of three times of standard deviation (3S) was used to calculate the detection limit of the method, and the detection limit was from 0.0018% to 0.0047%. The corresponding concentration of ten times of standard deviation (10S) was used to calculate the quantitation limit of the method, and the limit of quantitation was from 0.0060% to 0.016%. Six repeated tests were performed on two samples, and the relative standard deviations (RSDs (n=6)) of the test were from 0.60% to 0.78%. Compared to standard method, absolute error was less than 0.2% and the relative error was less than 2.0%. The results showed that the method can be used for simultaneous determination of ZrO2 and TiO2 in alkali-resistant fiberglass mesh., with fast analysis and reliable results.

The fluorimetric determination of cerium and terbium

1989 ◽  
Vol 54 (3) ◽  
pp. 616-621 ◽  
Author(s):  
Záviš Holzbecher
Keyword(s):  
Rare Earth ◽  
Detection Limit ◽  
Rare Earth Elements ◽  
Fluorimetric Determination ◽  
Fluorescence Maximum ◽  
Relative Standard ◽  
And Shifts ◽  
Hcl Medium ◽  
Fold Excess

It has been found that phosphoric acid decreases the first excitation maximum of Ce(III) at 256 nm, increases the second excitation maximum at 297 nm and shifts the fluorescence maximum from 350 to 346 nm. Under optimum conditions, with λexc = 297 nm and λem = 346 nm, Ce(III) can be determined fluorimetrically with a detection limit of 1.2 ng ml-1 in 12M-H3PO4 medium. No interference was observed from a 20-200 fold excess of HCl, H2SO4, Na, K, NH4+, Al and the rare earth elements. HNO3 interferes and Ce(IV) and Fe(III) interfere strongly. It follows from the stereofluorograms of Ce and Tb that the spectra of the two elements are practically independent. The detection limit for Tb(III) in 0.02-2.5M-H2SO4 medium for λexc = 222 nm and λem = 494 nm is 33 ng ml-1. No interference was observed from a 5-20 fold excess of Al3+ and the other rare earth elements. The determination is slightly less sensitive in H3PO4 or HCl medium. The relative standard deviation of the measurement for 10 ng ml-1 Ce(III) or 50 ng ml-1 Tb(III) is about 3%.

scholarly journals Spectrophotometric flow injection procedure to indirect determination of paracetamol in pharmaceutical formulations using o-tolidine as reagent

2018 ◽  
Vol 33 (2) ◽  
pp. 47
Author(s):  
Orlando Fatibello-Filho ◽  
Heberth Juliano Vieira
Keyword(s):  
Standard Deviation ◽  
Detection Limit ◽  
Flow Injection ◽  
Pharmaceutical Formulations ◽  
Injection Method ◽  
Indirect Determination ◽  
Analytical Curve ◽  
Relative Standard ◽  
Injection Procedure

A spectrophotometric flow injection method for the determination of paracetamol in pharmaceutical formulations is proposed. The procedure was based on the oxidation of paracetamol by sodium hypochloride and the determination of the excess of this oxidant using o-tolidine dichloride as chromogenic reagent at 430 nm. The analytical curve was linear in the paracetamol concentration range from 8.50 x 10-6 to 2.51 x 10-4 mol L-1 with a detection limit of 5.0 x 10-6 mol L-1. The relative standard deviation was smaller than 1.2% for 1.20 x 10-4 mol L-1 paracetamol solution (n = 10). The results obtained for paracetamol in pharmaceutical formulations using the proposed flow injection method and those obtained using a USP Pharmacopoeia method are in agreement at the 95% confidence level.

scholarly journals Preconcentration of Copper with Solid Phase Extraction and its Determination by Flame Atomic Absorption Spectrometry

2008 ◽  
Vol 5 (4) ◽  
pp. 878-883 ◽  
Author(s):  
Ayob Parchehbaf Jadid ◽  
Habibollah Eskandari
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Copper Ions ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Flame Atomic Absorption ◽  
Low Levels ◽  
Determination Of Copper

A new method for the solid phase extraction (SPE) and determination of copper ions at low levels is presented. Extraction percent and the effects of some factors were evaluated. The detection limit was in the range of 2.26 µg·L-1. This procedure has been successfully applied to determination of copper in water samples.

scholarly journals Determination of Sulfate in Natural and Residual Waters by Turbidimetric Flow-Injection Analysis

2001 ◽  
Vol 84 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Inês P A Morais ◽  
António O S S Rangel ◽  
M Renata S Souto
Keyword(s):  
Detection Limit ◽  
Flow Injection ◽  
Reference Method ◽  
Previous Treatment ◽  
Barium Chloride ◽  
Sulfate Solution ◽  
Injection System ◽  
Residual Water ◽  
Relative Standard

Abstract A turbidimetric flow-injection system was developed for the determination of sulfate in natural and residual water samples, with no previous treatment, using spectrophotometric detection. The precipitating agent, 7.0% (w/v) barium chloride solution prepared in 0.10% (w/v) polyvinyl alcohol, was added by using the merging-zones approach. A 100 mg/L sulfate solution in 0.07M nitric acid was mixed with the sample before it entered the injection loop to improve the detection limit, provide in-line pH adjustment, and prevent the interference of some anionic species. The relative standard deviations of the results were between 1.4 and 3.0% and were in agreement with results obtained by the reference method. Samples within a linear concentration range of 10–120 mg SO42−/L can be analyzed at a rate of 40/h. The detection limit is 5 mg SO42−/L.

scholarly journals A Double-Line Sequential Injection System for the Spectrophotometric Determination of Copper, Iron, Manganese, and Zinc in Waters

2005 ◽  
Vol 88 (2) ◽  
pp. 639-644 ◽  
Author(s):  
Inês P A Morais ◽  
M Renata S Souto ◽  
António O S S Rangel
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Absorption Spectrometry ◽  
Injection System ◽  
Sequential Injection ◽  
Double Line ◽  
Relative Standard ◽  
Iron Manganese ◽  
Determination Of Copper

Abstract A double-line sequential injection system was developed for the spectrophotometric determination of several metal ions in waters. The proposed double-line configuration was used to enable adding sample and chromogenic reagents as merging zones. The methodology was applied to the spectrophotometric determination of copper, iron, manganese, and zinc in samples of diverse origins at the range of 0.15–5.00, 0.10–10.0, 0.48–4.00, and 0.11–5.00 mg/L, respectively. Different chromogenic reagents and detection wavelengths were used. The chromogenic reagents for iron and manganese were 1,10-phenanthroline and formaldoxime, respectively. Copper and zinc were both determined using the analytical reagent zincon. Analytical characteristics of the methodology, such as manifold parameters, buffer pH, and reagent concentrations were optimized, and interference of some of the metal ions commonly present in water sample was assessed. Results of the analysis were in agreement with those obtained by atomic absorption spectrometry. Repeatability, expressed as the relative standard deviation for 10 consecutive injections of water samples, was lower than 6%. The determination rate was approximately 36/h.

The Removal of Interference from Microwave Digestion Solution of Industrial Wastewater on the Determination of Arsenic

2014 ◽  
Vol 587-589 ◽  
pp. 625-628
Author(s):  
Ming Ming Yang ◽  
Hong Wei An
Keyword(s):  
Detection Limit ◽  
Microwave Digestion ◽  
Hydride Generation ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Quantitative Detection ◽  
Nitrite Ion ◽  
Digestion Solution ◽  
Relative Standard

In existing literature ,there is no unified time for the evaporating excessive acid to microwave digestion solution of different samples. a new method was developed .The interference from nitrite ion and volatile nitrogen oxides which were generated during digestion were quickly removed by the adding urea and heating with boiling water. The interference from nitrate was studied. Optimized conditions of determination of arsenic with hydride generation atomic absorption spectrometry. The detection limit was 0.3μg·L-1 and minimum quantitative detection limit was 1.0μg·L-1, the relative standard deviation of standard addition method in sample was 1.1% and recovery from 98 % to 102%.

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