Journal of Applied Spectroscopy
·
2014
·Vol. 81
·期 5
·807-811
·
IF 0.514
Liu Y.,Fan J.,Ma W.,Fu Ch.
An aqueous two-phase system of acetone and (NH 4 ) 2 SO 4 mixture has been developed for the extractive separation of copper (Cu). The complex formed by Cu(II) and Nuclear Fast Red was found to be extracted into the acetone-rich upper phase, and the absorbance of the complex was determined at 465 nm. Beer’s law was obeyed over the concentration range of ~0.6–3.2 mg/l for Cu(II) with a good linearity. The proposed method has been applied to the separation and determination of Cu(II) in seafood samples with a coefficient of variation less than 2.8%. The recovery obtained was ~96.3–101.7%.
研究领域:
分析化学
·
环境化学
·
食品安全检测
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Jinbin Lin,Junyang Xiao,Hengyu Cai,Yixin Huang,Jiawen Li,Haoyu Yang,Tao Li,Jing Zou
In this study, a multi-wavelength spectrophotometric method for simultaneous determination of peracetic acid (PAA) and coexistent hydrogen peroxide (H 2 O 2 ) was presented. This method was based on the oxidation of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) with the assistance of Fe 2+ /KI to produce a stable green radical (ABTS ●+ ), which could be determined at four characteristic peaks (i.e., 415 nm, 650 nm, 732 nm, and 820 nm). The absorbances of ABTS ●+ at four peaks were well linear (R 2 > 0.999) with concentrations of both total peroxides (PAA + H 2 O 2 ) and PAA in the range of 0–40 μM under optimized conditions. The sensitivities for determining total peroxides at 415 nm, 650 nm, 732 nm and 820 nm were determined to be 4.248 × 10 4 M −1 cm −1 , 1.682 × 10 4 M −1 cm −1 , 2.132 × 10 4 M −1 cm −1 , and 1.928 × 10 4 M −1 cm −1 , respectively. For determining PAA, the corresponding sensitivities were 4.622 × 10 4 M −1 cm −1 , 1.895 × 10 4 M −1 cm −1 , 2.394 × 10 4 M −1 cm −1 and 2.153 × 10 4 M −1 cm −1 , respectively. The concentration of coexistent H 2 O 2 was gained by deducting PAA concentration from total peroxides concentration. The ABTS method was accurate enough to determine PAA concentration in natural water samples. Moreover, the ABTS method was successfully used to determine the changes of PAA and coexistent H 2 O 2 and to distinguish their role on naproxen degradation in heat-activated PAA process. Overall, the ABTS method could be used as an alternative method for the convenient, rapid and sensitive determination of PAA and the coexistent H 2 O 2 in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2012
·Vol. 16
·期 2
·265-269
·
IF 1.545
Yinghong Liu,Huijuan Wu,Weixing Ma
A direct, extraction-free spectrophotometric method was developed for the determination of benzalkonium bromide (BAK). The method is based on the formation of mixed dye–surfactant aggregates between alizarin green (AG) and BAK in alkaline medium by measuring the decrease in absorbance of AG at 460 and 700 nm. Beer's law was obeyed in the concentration range 3–40 μg mL −1 with good precision and accuracy. The limits of detection were 0.4 μg mL −1 at 460 nm and 0.3 μg mL −1 at 700 nm, which reduced to 0.2 μg mL −1 by combining the absorbance at the two wavelengths. The proposed method was successfully applied to the determination of BAK in disinfectant solution and eye drops. The analytical results of the real samples were in good agreement with those of an HPLC method.
研究领域:
分析化学
·
药学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Songil Sin,Jiawei Ji,Lijun Cheng,Zhiwen Gu,Chong Tan,Kwangchol Ri,Changjin Tang
CeO 2 -based catalysts are widely investigated for selective catalytic reduction (SCR) of NO with NH 3 . Interaction of NO/O 2 with CeO 2 generally produces two surface species, i.e., nitrates and nitrites. However, the explicit quantification of these two species is still unresolved. Herein, we reported that spectrophotometry characterization was effective in determining surface adsorbed NO x species on CeO 2 by measuring the corresponding ions (NO 2 – and NO 3 – ) dissolved in aqueous solution. Experimental results show that both nitrate (–NO 3 ) and nitrite (–NO 2 ) species can be quantitatively evaluated and the accuracy is verified by calibrating with NO x -TPD result. Exclusive transfer of adsorbed NO x from catalyst surface to aqueous solution is confirmed and the dissolution process can be accelerated by ultrasonic treatment. Moreover, useful information related to evolution of surface NO x species under various conditions (O 2 treatment, different adsorption temperature and duration) and over different catalysts (Fe 2 O 3 , MnO 2 and MnO x –CeO 2 ) are provided. The result of present study demonstrates the potential of spectrophotometry for quantitative discrimination of surface NO x species on CeO 2 and other oxide-based materials, which is conducive to mechanism analysis of SCR reaction.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Tao Li,Lin Dai,Yixin Huang,Siwen Pan,Zijun Pang,Jing Zou
Nowadays, a number of spectrophotometric methods for Cr(VI) determination have been developed. Whereas most of them are sensitive to pH, metallic ions, temperature, etc, which render them out of feasibility and may result in erroneous measurement. Therefore, to overcome these drawbacks, a new spectrophotometric method with rapid detection, high accuracy and strong anti-interference ability was established. This method is based on the oxidative coloration of N,N -diethyl- p -phenylenediamine (DPD) and Cr(VI) to generate pink-colored DPD •+ radicals which showed maximum absorbance at 551 nm. Accordingly, different reaction parameters were optimized, the calibration curves (linear range 0.85–60 µM) were established with a high sensibility of (3.05 ± 0.02) × 10 4 M −1 cm −1 . The LOD and LOQ were determined to be 0.26 µM and 0.85 µM respectively, accompanied with a stoichiometric coefficient of near 1:3 (1:2.78). The DPD method exerted a satisfactory accuracy in natural water samples and a pretty good anti-interference performance towards various common co-existing metallic ions. Moreover, this method was successfully applied in the Cr(VI)-sulfite and Cr(VI)-hydroxylamine systems. Overall, the study highlights the DPD method as a promising approach for the Cr(VI) determination and provides a new perspective for the practices of spectrophotometry .
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Yongning Bian,Yaling Wang,Houqun Yuan,Guang-Ming Bao,Dongdong Su
Phosgene is a suffocating toxic gas that seriously threatens human health and public security. In this work, we devised a colorimetric and fluorogenic chemosensor ( BDY ) for phosgene by using 3,5-dimethyl BODIPY as a fluorescent reporter and o -phenylenediamine as the recognition site. The BDY sensor displayed an obvious color change from yellow to pink in conjugation with a fluorescence turn-on response due to nucleophilic substitution and cyclization reactions with phosgene. BDY could detect phosgene with a rapid response (9 s), low detection limit (14 nM), and outstanding selectivity. Moreover, BDY -loaded test strips were prepared to serve as portable and sensitive kits for real-time visual monitoring phosgene with good performance.
研究领域:
化学传感
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Jing Zou,Huahua Cai,Daiyao Wang,Junyang Xiao,Zhenming Zhou,Baoling Yuan
A low-cost and environmentally-friendly spectrophotometric method for hydrogen peroxide (H 2 O 2 ) determination based on the oxidative coloration reaction of N,N′ -diethyl- p -phenylenediamine (DPD) via the Fenton reactions in aqueous water was established. The generated pink radical cation (DPD + ) showed maximum absorption at 551 nm. Importantly, under the optimal conditions (pH 3.0, 20 mM DPD, 1.5 mM Fe(II) and reaction time of 45 s), the increase in absorbance at 551 nm for DPD + generation was linear with respect to the addition of H 2 O 2 (0–12 μM). The sensitivity and the detection limit of the proposed Fenton-DPD method for H 2 O 2 determination at 551 nm were (2.55 ± 0.01) × 10 4 M −1 cm −1 and 0.05 μM, respectively. The stoichiometric factor for the reaction of H 2 O 2 with DPD was 1:1.18. The absorbance of the generated DPD + was found to be stable in different types of water within 20 min. Moreover, the proposed Fenton-DPD method could be used for the analysis of the trace H 2 O 2 in rainwater and determine the rate constants that involved H 2 O 2 with high accuracy.
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2014
·
IF 2.129
Jiao Zhao,Yunhui Lu,Chongyang Fan,Jun Wang,Yaling Yang
A novel and simple method for the sensitive determination of trace amounts of nitrite in human urine and blood has been developed by combination of cloud point extraction (CPE) and microplate assay. The method is based on the Griess reaction and the reaction product is extracted into nonionic surfactant Triton-X114 using CPE technique. In this study, decolorization treatment of urine and blood was applied to overcome the interference of matrix and enhance the sensitivity of nitrite detection. Multi-sample can be simultaneously detected thanks to a 96-well microplate technique. The effects of different operating parameters such as type of decolorizing agent, concentration of surfactant (Triton X-114), addition of (NH 4 ) 2 SO 4, extraction temperature and time, interfering elements were studied and optimum conditions were obtained. Under the optimum conditions, a linear calibration graph was obtained in the range of 10–400 ng mL −1 of nitrite with limit of detection (LOD) of 2.5 ng mL −1 . The relative standard deviation (RSD) for determination of 100 ng mL −1 of nitrite was 2.80%. The proposed method was successfully applied for the determination of nitrite in the urine and blood samples with recoveries of 92.6–101.2%.
研究领域:
分析化学
·
医学检验
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 30
·4471-4475
·
IF 1.9
L. F. Tian,D. S. Zou,Y. C. Dai,L. L. Wang,W. Gao
Quantification of chromium in V–Cr–Ti ternary alloys, used as candidate structural materials for fusion reactors, is essential in view of its significant effect on the properties of these vanadium-based alloys. Various methods have already been used for the determination of chromium in common alloys, but most of these methods are based on complicated and expensive instruments or suffer from the serious matrix interference of vanadium. In this study, a simple, rapid and accurate spectrophotometric method was developed for the determination of chromium in V–Cr–Ti alloys without any prior separation and chromogenic agent. The alloy samples were dissolved in diluted sulphuric acid and concentrated nitric acid, and chromium was oxidized with persulphate in the presence of Ag(I) ions as a catalyst. After alkalization of the solution with sodium hydrate, greenish-yellow coloured chromate (CrO42−) ions were formed in the alkaline solution and had a maximum absorption peak at 374 nm. Beer's law was obeyed in the range of 0.15–12.0 μg mL−1 Cr(VI) at 374 nm and the molar absorptivity was 4.8 × 103 L mol−1 cm−1. All the variables were studied in order to optimize the analytical conditions. Vanadium and titanium seriously interfered with the determination of Cr(VI) and their interference can be eliminated by addition of ammonium tartrate. The proposed method is simple, fast, accurate and of low cost, and has been satisfactorily used for the determination of chromium in V–Cr–Ti alloys. The results are in good agreement with data given by inductively coupled plasma optical emission spectrometry (ICP-OES) and the relative standard deviation is found to be lower than 0.4%.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Huahua Cai,Xin Liu,Jing Zou,Junyang Xiao,Baoling Yuan,Fei Li,Qingfeng Cheng
In this study, a new spectrophotometric method was proposed for the measurement of hydrogen peroxide (H 2 O 2 ) in aqueous solutions. The method was based on the peroxidase (POD)-catalyzed reaction in which 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) was oxidized to form the stable green radical (ABTS + ). The generated ABTS + could be determined spectrophotometrically. The absorbance of the generated ABTS + at 415 nm, 650 nm, 732 nm and 820 nm were linear with H 2 O 2 concentrations in the range of 0–40 μM. The sensitivities of the proposed ABTS method for H 2 O 2 determination at 415 nm, 650 nm, 732 nm and 820 nm were 6.29 × 10 4 M −1 cm −1 , 2.00 × 10 4 M −1 cm −1 , 2.54 × 10 4 M −1 cm −1 and 1.89 × 10 4 M −1 cm −1 , respectively. The oxidation of ABTS to generate ABTS + in POD-catalyzed H 2 O 2 system at pH 6.0 was so fast that the determination time of the ABTS method was as short as 0.5 min. The stoichiometry of the reaction of H 2 O 2 and ABTS in the presence of POD was calculated as nearly 1:2 (1:1.92). The residual absorbance of the generated ABTS + was also found to be stable within 30 min in natural waters. Low H 2 O 2 concentration in rainwater could be both measured by the ABTS method and the DPD method with high accuracy, however, H 2 O 2 concentration in wastewater contained rhodamine B could only be accurately measured with the ABTS method at 732 nm. Moreover, waste solutions after H 2 O 2 analysis with the proposed ABTS method were non-hazardous towards E. coli .
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ling Wu,Feng Li,Haidong Yu,Luping Shen,Mingxi Wang
Spectrophotometry is an economic and rapid method for detecting oxalic acid (OA), while the reported methods have some drawbacks, such as narrow linear range, long response time, delicate operation and required expensive reagents. Herein, we found that the as-synthesized Fe(III)-sulfosalicylate (FeSSA) could be used as an efficient colorimetric chemosensor to detect OA, and the established FeSSA-based fading spectrophotometry showed prominent advantages over the existing ones in detecting OA. The as-established method has wider linear range of 0.80–160 mg/L with regression coefficient ≥ 0.999, while the widest linear range is just 2.7–54 mg/L among the reported ones. Moreover, the method has low limit of detection (0.74 mg/L), extremely fast response (several seconds), satisfactory selectivity, high accuracy and precision. Most importantly, its reliability was further verified by employing it to determine OA concentration during the degradation process of organic pollutants. The measured OA concentration at any time interval was perfectly consistent with those determined by the well-recognized high performance liquid chromatography (HPLC). These confirmed that the FeSSA-based fading spectrophotometry is an efficient, simple, fast, accurate and economic method to determine OA in a wide concentration range.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 7
·4015-4022
·
IF 1.134
Wang Baomin,Deng Shuang,Zhao Lu
Graphene nanoplates (GNPs) are carbon nanomaterials with two-dimensional structure which is easy to reunite and their dispersion is necessary before using. The existing methods for dispersion characterization mainly include UV spectrophotometry, scanning electron microscope (SEM), transmission
electron microscopy (TEM) and Atomic Force Microscopy (AFM). In this research study, sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene (40) nonylphenyl ether, branched (CO890), polyvinyl pyrrolidone (PVP) and cetyltrimethyl ammonium bromide (CTAB) were used as dispersants, and ultrasonic
treatment was employed as dispersion method. Ultraviolet spectrum for GNPs showed that some errors were attained, resulting from dispersant at 274 nm characteristic wavelength of GNPs dispersions with deionized water as controlled sample. The errors could be eliminated if dispersant solution
was used as controlled sample. The microstructures of dispersed GNPs observed by SEM, TEM and AFM suggested that the GNPs were dispersed uniformly with 2.5 g/L SDBS, which showed the best dispersion effect. Raman spectrum indicated that more chaotic distribution and edge structures were achieved
after dispersion.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）