ICP-AES Determination of Sulfide and Sulfate Content in Pebble and Crushed Stone

2017 ◽  
Vol 726 ◽  
pp. 70-74
Author(s):  
Qian Nan Li ◽  
Man Li ◽  
Qing Dan Yuan ◽  
Dan Hua Xu
Keyword(s):  
Sulfur Trioxide ◽  
National Standard ◽  
Crushed Stone ◽  
Test Results ◽  
Sulfate Content ◽  
Pretreatment Method ◽  
Relative Standard ◽  
Weight Method ◽  
Sulphur Trioxide

Generally, the content of sulfide and sulfate (expressed as a sulphur trioxide) in pebble and crushed stone for construction is low. So use the weight method specified in the national standard method for determination, is not only tedious and time consuming, but also not accurate enough. In this paper, with reference to the pretreatment method of the relevant national standard, rapid and accurate test results can usually be obtained for the determination of sulfur trioxide in and crushed stone for construction by using ICP-AES as a new method, greatly reducing the time of the experiment and improve the efficiency. According to the analysis of spectrum interference, 182.0 nm was selected as the best analysis of spectral line for sulfur. The detection line of this method (3S) was 0.016 mg/L, the recovery rate of the sample was between 93.3%-104.0%, and the relative standard deviation (n=6) of the parallel samples was less than 1.05%.

Determination of the Emission of Volatile Organic Compounds from Leather Seats in Environmental Test Chamber

2018 ◽  
Vol 768 ◽  
pp. 31-35
Author(s):  
Jin Wang ◽  
Zhen Zhu Ma ◽  
Lu Chen ◽  
Hong Juan Sun ◽  
Wu Kun Fan
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Test Chamber ◽  
Paper Analysis ◽  
National Standard ◽  
Test Results ◽  
Total Volatile Organic Compound ◽  
Volatile Organic ◽  
Environmental Test

With reference to the international standard ISO16000-9 and the national standard GB/T 31106-14, this paper has chosen leather seats as the research object in order to study the emission of volatile organic compounds (VOCs) and total volatile organic compound (TVOC). The test results show that about 21 species of VOCs released from the leather seats were measured, including several types of aldehydes, ketones, aromatic hydrocarbon ,hydrocarbon, lipids and so on.This paper analysis the possible sources of volatile organic compounds in leather seats as well.

scholarly journals Badanie stabilności barwnych znaczników fluorescencyjnych w silnie zasiarczonych wodach złożowych

Nafta-Gaz ◽  
2021 ◽  
Vol 77 (2) ◽  
pp. 82-91
Author(s):  
Katarzyna Wojtowicz ◽  
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Rhodamine B ◽  
Water Reservoir ◽  
Distilled Water ◽  
Test Results ◽  
Fluorescent Tracers ◽  
Reservoir Water ◽  
Relative Standard

The article presents the issues related to the determination of colored fluorescent tracers such as fluorescein, eosin yellowish, rhodamine B and uranine in reservoir waters by spectrophotometric method. For this purpose, the influence of the pH of the solution on the absorption spectra of the tested tracers was checked. Test results show that fluorescein, rhodamine B and uranine are sensitive to changes in the buffer pH, therefore it is advisable to use stable tracer solutions as well as to control and possibly correct pH in further tests. As part of the study, calibration curves of fluorescein, eosin yellowish, rhodamine B and uranine in distilled water, reservoir water A4 and highly sulfated reservoir waters A5 and A6 were plotted and the analytical methods were validated. Analytical validation included determination of linearity, standard deviation and relative standard deviation of the tested tracers solutions. High values of the regression parameters (0.9927–0.9998) of the analyzed tracers prove a good linear fit, while low values of standard deviation and relative standard deviation prove its repeatability and precision. Particular attention was paid to testing the stability of colored fluorescent tracers in highly sulfated reservoir waters. For this purpose, solutions of the tested tracers were prepared at concentrations of 10 mg/dm3 in distilled water, A4 reservoir water and highly sulfated A5 and A6 reservoir waters. Measurements of the tested tracers in the prepared solutions were performed every 2 days over the period of 1 month. The test results show that fluorescein, eosin yellowish, rhodamine B and uranine solutions are stable in the distilled water and A4 reservoir water, while they degrade in the A5 and A6 reservoir waters. Fluorescein and uranine turned out to be the most sensitive, as they degraded completely in the A6 reservoir water after 20 (fluorescein) and 22 (uranine) days. Yellowish eosin and rhodamine B turned out to be slightly more stable in highly sulfated reservoir waters, as they degraded completely in the A6 reservoir water after 24 days.

scholarly journals Determination of Ca3(PO4)2 in Bone China by Microwave Digestion-ICP-AES

2021 ◽  
Vol 245 ◽  
pp. 03088
Author(s):  
Zheng-gen Huang ◽  
He-ying Yi ◽  
Tao Wang ◽  
Lian-ying An ◽  
Xiao-bin Zhao
Keyword(s):  
Detection Limit ◽  
Tricalcium Phosphate ◽  
Microwave Digestion ◽  
Test Method ◽  
National Standard ◽  
Good Precision ◽  
Test Results ◽  
Established Method ◽  
Bone China

The establishment of a microwave digestion method with the advantages of simple operation and complete digestion to process samples has shown that, high sensitivity, wide linear dynamic range, good precision, fast analysis speed and many other advantages of ICP-AES technology for rapid determination of tricalcium phosphate in bone china. Through the use of different P2O5 content of phosphate rock and kaolin national standard material configuration standard working solution for matrix matching to eliminate matrix interference, the microwave digestion sample processing condition selection, coexisting ion interference, method precision, accuracy, and detection limit tests were carried out. The results showed that the detection limit of the newly established method for tricalcium phosphate is 0.011mg.L-1; the HCl-HNO3-HF-H2O2 mixed acid decomposition system dissolves the best samples; the interference of the test results through the matrix matching coexisting ion pair is small; The relative standard deviation (RSD) is 1.08%~4.64%, and the recovery rate of standard addition is 92.4%~107.9%. The established method has high accuracy and precision; the bone china samples are analyzed and compared with the conventional digestion national standard method The t test method is used to prove that the two methods are not significantly different from the test results.

Correction of Loss on Ignition in Slag Powder by ICP-AES

2017 ◽  
Vol 726 ◽  
pp. 60-64
Author(s):  
Man Li ◽  
Qian Nan Li ◽  
Ming Yu Wang ◽  
Dan Hua Xu ◽  
Qing Dan Yuan
Keyword(s):  
Spectral Analysis ◽  
Standard Deviation ◽  
Detection Limit ◽  
Traditional Method ◽  
National Standard ◽  
Loss On Ignition ◽  
Pretreatment Method ◽  
Slag Powder ◽  
Relative Standard ◽  
Before And After

In this work, with reference to the pretreatment method of the relevant national standard, we tested the content of SO3 in slag powder before and after burning by ICP-AES, then the result of burning loss was corrected by the content of SO3. The content of SO3 which was determined by this new method is fast and accurate, compared with the traditional method. We selected the wavelength of 182.0nm as spectral analysis of SO3. The detection limit of the method (3S) was 0.016 mg/L, the recovery rate of the sample was between 97%-104%, and the relative standard deviation (n=6) of the parallel samples was less than 1.05%.

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

scholarly journals Validation of an HPLC Method for Pretreatment of Steviol Glycosides in Fermented Milk

Foods ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2445
Author(s):  
Jin-Man Kim ◽  
Jong-Ho Koh ◽  
Jung-Min Park
Keyword(s):  
Dairy Products ◽  
Limit Of Detection ◽  
Accurate Determination ◽  
Daily Intake ◽  
Steviol Glycosides ◽  
Limit Of Quantification ◽  
Pretreatment Method ◽  
Steviol Glycoside ◽  
Relative Standard

Steviol glycosides are used in food and beverages worldwide as natural sweeteners, serving as a low-calorie sugar substitute. The acceptable daily intake of steviol is 0–4 mg/kg body weight. The rising demand for dairy products has led to a corresponding increase in the use of steviol glycosides in such products. Therefore, it is important to analyze the levels of steviol glycosides in dairy products. Dairy products have high fat contents and unique emulsion characteristics, conferred by a mixture of fat globules, casein micelles, whey proteins, and numerous other small molecules. These characteristics may interfere with the estimation of steviol glycoside levels; therefore, dairy samples require pretreatment. We aimed to develop an objective test for measuring the levels of steviol glycosides through the development of an efficient pretreatment method. In this study, the steviol glycoside content in dairy products was evaluated by using various methods, and an optimal pretreatment method was determined. We used high-performance liquid chromatography to assess the selectivity, linearity, limit of detection, limit of quantification, accuracy, precision, and recovery rate. Calibration curves were linear in the range of 1–50 mg/kg, with a coefficient of determination of ≥0.999. The limit of detection and limit of quantification were in the ranges of 0.11–0.56 and 0.33–1.69 mg/kg, respectively. The relative standard deviation (%) represents the precision of a measurement. The RSD relative standard deviationof recovery varied between 0.16% and 2.83%, and recovery of the analysis varied between 83.57% and 104.84%. These results demonstrate the reliability of the method for measuring the steviol glycoside content. This method can be used for the simple pretreatment of steviol glycosides and can provide an accurate determination of steviol glycoside content in emulsified food matrices, such as dairy products.

Determination of Heavy Metal Elements in Farm Products Taros and Agricultural Soil by Inductively Coupled Plasma-Optical Emission Spectrometry and Assessment

2011 ◽  
Vol 233-235 ◽  
pp. 1132-1135
Author(s):  
Can Cao ◽  
Hua Ye ◽  
Guo Hui Chen ◽  
Li Na He
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Agricultural Soil ◽  
State Standards ◽  
National Standard ◽  
Emission Spectrometry ◽  
Food Crops ◽  
Wet Digestion ◽  
Relative Standard

This study was designed to determine the heavy metal concentrations in soils and food crops and estimate the potential health risks of metals to polluted food crops and soil, so agricultural soil for the cultivation and taro were main objects of study, taro were taken in the HNO3-H2O2 wet digestion, while soil were taken to HCl-HNO3-HF-HClO4 wet digestion by (ICP-OES),then coments and analysis on the samples were carried out by comparing with their limits of relative state standards. The analytical results indicate that for all of the analyzed elements the relative standard deviations (RSD) are 0.9-4.9% and the recoveries of most elements are in the range of 96.84-104.96%. Zn, As, Cd and other contents in soil samples were detectable beyond their limits of state standards, while heavy metals contents in the investigated samples were found at different polluted levels. Cd, Cr, As, Zn, Cu in taros also exceeded the national standard. It was found that there are enrichment of heavy metals in taro. It is concluded that the present techniques are suitable for the routine determination of heavy metals concentration in the food crops-soil systems.

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.

An Automated Procedure for the Determination of Ammonia in Tobacco

1972 ◽  
Vol 6 (4) ◽  
Author(s):  
P.F. Collins ◽  
W.W. Lawrence ◽  
J.F. Williams
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Distillation Method ◽  
Relative Standard ◽  
Tobacco Sample ◽  
Automated Determination

AbstractA procedure for the automated determination of ammonia in tobacco has been developed. Ammonia is extracted from the ground tobacco sample with water and is determined with a Technicon Auto Analyser system which employs separation of the ammonia through volatilization followed by colourimetry using the phenate-hypochlorite reaction. The procedure has been applied to a variety of tobaccos containing from 0.02 to 0.5 % ammonia with an overall relative standard deviation of 2 %. The accuracy of the procedure as judged by recovery tests and by comparison to a manual distillation method is considered adequate

Effect of Ethanol Treatment on Lycopene Extraction yield

2018 ◽  
Author(s):  
Nam Kyong-il ◽  
KIM rak-chon ◽  
Kang chang-hyok ◽  
Lee song-nam ◽  
Ryom sok-hun
Keyword(s):  
Antioxidant Activity ◽  
Treatment Time ◽  
Extraction Yield ◽  
Extraction Rate ◽  
Test Results ◽  
Ethanol Treatment ◽  
Optimum Conditions ◽  
Liquid Ratio ◽  
Pretreatment Method ◽  
Ethanol Pretreatment

In order to extract lycopene more effectively, this experiment focused on the optimization of ethanol pretreatment method to study the effects of ethanol treatment on the extraction rate of lycopene and its antioxidant activity. The test results show that 2 times ethanol treatment is very effective for improving lycopene yield. The optimum conditions of ethanol treatment are temperature 50 ℃, treatment time 1 time 2h, 2 times 2h, solid to liquid ratio is 1:12. The lycopene yield can be reached 20mg / 100g above.

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