Colorimetric detection of hypochlorite in tap water based on the oxidation of 3,3′,5,5′-tetramethyl benzidine

2015 ◽  
Vol 7 (10) ◽  
pp. 4055-4058 ◽  
Author(s):  
Yongming Guo ◽  
Qinge Ma ◽  
Fengpu Cao ◽  
Qiang Zhao ◽  
Xuewei Ji
Keyword(s):  
Tap Water ◽  
Colorimetric Detection ◽  
Simple Method ◽  
Water Based ◽  
Tetramethyl Benzidine

A simple method for the colorimetric detection of hypochlorite in tap water with good selectivity and sensitivity has been developed by utilization of the oxidation of 3,3′,5,5′-tetramethylbenzidine.

scholarly journals Estimating perchlorate exposure from food and tap water based on US biomonitoring and occurrence data

2010 ◽  
Vol 21 (4) ◽  
pp. 395-407 ◽  
Author(s):  
David R Huber ◽  
Benjamin C Blount ◽  
David T Mage ◽  
Frank J Letkiewicz ◽  
Amit Kumar ◽  
...  
Keyword(s):  
Tap Water ◽  
Occurrence Data ◽  
Water Based

scholarly journals Detection of plastics in water based on their fluorescence behavior

2020 ◽  
Vol 9 (2) ◽  
pp. 337-343
Author(s):  
Maximilian Wohlschläger ◽  
Martin Versen
Keyword(s):  
Environmental Pollution ◽  
Water Depth ◽  
Tap Water ◽  
Fluorescent Light ◽  
Imaging Method ◽  
Environmental Matrices ◽  
Established Method ◽  
Highly Sensitive ◽  
Water Based ◽  
Water Depths

Abstract. Plastic waste is one of the biggest growing factors contributing to environmental pollution. So far there has been no established method to detect and identify plastics in environmental matrices. Thus, a method based on their characteristic fluorescence behavior is used to investigate whether plastics can be detected and identified in tap water under laboratory conditions. The experiments show that the identification of plastics as a function of water depth is possible. As the identification becomes more difficult with higher water depths, investigations with a highly sensitive imaging method were carried out to obtain an areal integration of the fluorescent light and thus better results.

scholarly journals Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1467
Author(s):  
Salman Siddique ◽  
Jeong Gook Jang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sea Water ◽  
Tap Water ◽  
Pure Water ◽  
Degree Of Polymerization ◽  
29Si Nmr ◽  
Water Based ◽  
Ft Ir ◽  
Alkali Activated

The aim of the present study is to investigate the potential of sea water as a feasible alternative to produce alkali-activated fly ash material. The alkali-activated fly ash binder was fabricated by employing conventional pure water, tap water, and sea water based alkali activating solution. The characteristics of alkali-activated materials were examined by employing compressive strength, mercury intrusion porosimetry, XRD, FT-IR, and 29Si NMR along with ion chromatography for chloride immobilization. The results provided new insights demonstrating that sea water can be effectively used to produce alkali activated fly ash material. The presence of chloride in sea water contributed to increase compressive strength, refine microstructure, and mineralogical characteristics. Furthermore, a higher degree of polymerization on the sea water-based sample was observed by FT-IR and 29Si NMR analysis. However, the higher amount of free chloride ion even after immobilization in sea water-based alkali-activated material, should be considered before application in reinforced structural elements.

Pilot-Scale Evaluation of Natural-Gas-Based Foam at High Pressures, Temperatures

2021 ◽  
Vol 73 (06) ◽  
pp. 60-61
Author(s):  
Chris Carpenter
Keyword(s):  
Natural Gas ◽  
Base Fluid ◽  
Produced Water ◽  
Tap Water ◽  
Pilot Scale ◽  
Test Facility ◽  
Foaming Agent ◽  
Scale Evaluation ◽  
Fracturing Fluids ◽  
Water Based

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 201611, “A Pilot-Scale Evaluation of Natural-Gas-Based Foam at Elevated Pressure and Temperature Conditions,” by Griffin Beck, Swanand Bhagwat, and Carolyn Day, Southwest Research Institute, et al., prepared for the 2020 SPE Annual Technical Conference and Exhibition, originally scheduled to be held in Denver, 5–7 October. The paper has not been peer reviewed. The complete paper presents recent results from a rigorous pilot-scale demonstration of natural-gas (NG) foam over a range of operating scenarios relevant to surface and bottomhole conditions with a variety of base-fluid mixtures. The NG foams explored in these investigations exhibited typical shear-thinning behavior observed in rheological studies of nitrogen- (N2) and carbon-dioxide- (CO2) based foams. The measured viscosity and observed stability indicate that NG foams are well-suited for fracturing applications. Test Facilities Two test facilities were used to explore properties of NG foams at a variety of relevant operating conditions to determine whether NG foam is a suitable alternative to typical water-based fracturing fluids. Pilot-Scale Foam-Test Facility. The pilot-scale foam-test facility (PFTF) is a single-pass pilot plant used to generate and characterize foams at conditions relevant to surface and reservoir conditions. The facility is capable of generating aqueous and oil-based foams using a variety of gases for the internal phase [e.g., methane (CH4), N2, and CO2]. Foams can be characterized at pressures up to 7,500 psi and temperatures up to 300°F. A key benefit of the PFTF is that it can be used to demonstrate new or challenging foaming processes before large-scale or field demonstrations. Further, these processes can be evaluated at conditions relevant to the final application. The test facility consists of three subsystems: a base-fluid system to pressurize and heat the liquid/viscosifier/surfactant mixture, a gas system to pressurize and heat the liquefied gas stream, and the foam test sections to measure various fluid properties of the NG foam. Laboratory Foam-Test Facility. Tests performed on the PFTF were limited to foams generated with pure CH4 and tap water. Additional laboratory tests were conducted to investigate the effects of multiconstituent natural gas mixtures and produced water on foam stability. For these tests, the aqueous base fluid for the foam half-life and foam rheology experiments was prepared from either de-ionized water, tap water, or a synthetic produced water based on a water sample from the Permian Basin. Foam fracturing fluids also typically contain a gelling agent and a foaming agent. The gel was prepared by slow addition of guar to a stirred water sample followed by 30 minutes of mixing to ensure complete hydration. The foaming agent was added and stirred in gently. Three foaming agents were used in this study: anionic Foamer A, nonionic Foamer B, and zwitterionic Foamer C.

scholarly journals Synthesis of Fluorescent Copper Nanoparticles and Ultrasensitive Free Label Detection of Ag+

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Ning Wang ◽  
Lu Ga ◽  
Meilin Jia ◽  
Jun Ai
Keyword(s):  
Heavy Metal ◽  
Visible Light ◽  
Linear Relationship ◽  
Fluorescent Probe ◽  
Copper Nanoparticles ◽  
Colorimetric Detection ◽  
Silver Ions ◽  
Simple Method ◽  
Environmental Detection

In recent years, the application of fluorescent copper nanomaterials in environmental detection has attracted much attention. This paper mainly introduces the synthesis of copper nanomaterials and the detection of Ag+. A simple method for the determination of Ag+ in water was established by using fluorescent copper nanoparticles synthesized by using glucose (Glc) as a reducing agent as a fluorescent probe. The experimental mechanism of this experiment is that silver ions can rapidly and effectively quench the fluorescence of Glc-CuNPs. A good linear relationship was observed in the range of Ag+ at 100 mol/L–600 mol/L (R=0.9845); the color is gradually enhanced under visible light and visual colorimetric detection. Moreover, the Glc-CuNP sensor selectively selected Ag+, which was not affected by other metal ions, indicating that Glc-CuNPs had good selectivity for the detection of Ag+. Based on this, Glc-CuNP completes the detection of heavy metal silver ions and has a good application prospect in environmental detection.

scholarly journals Photopolymerization-Based Synthesis of Uniform Magnetic Hydrogels and Colorimetric Glucose Detection

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4401
Author(s):  
Seok Joon Mun ◽  
Donghyun Ko ◽  
Hyeon Ung Kim ◽  
Yujin Han ◽  
Yoon Ho Roh ◽  
...  
Keyword(s):  
Light Absorption ◽  
Colorimetric Detection ◽  
Droplet Microfluidics ◽  
Magnetic Characteristics ◽  
Absorption Properties ◽  
Simple Method ◽  
Signal Transducers ◽  
Photoinitiated Polymerization ◽  
Peroxidase Enzyme ◽  
Poly Ethylene

Magnetic hydrogels have been commonly used in biomedical applications. As magnetite nanoparticles (MNPs) exhibit peroxidase enzyme-like activity, magnetic hydrogels have been actively used as signal transducers for biomedical assays. Droplet microfluidics, which uses photoinitiated polymerization, is a preferred method for the synthesis of magnetic hydrogels. However, light absorption by MNPs makes it difficult to obtain fully polymerized and homogeneous magnetic hydrogels through photoinitiated polymerization. Several methods have been reported to address this issue, but few studies have focused on investigating the light absorption properties of photoinitiators. In this study, we developed a simple method for the synthesis of poly(ethylene glycol) (PEG)-based uniform magnetic hydrogels that exploits the high ultraviolet absorption of a photoinitiator. Additionally, we investigated this effect on shape deformation and structural uniformity of the synthesized magnetic hydrogels. Two different photoinitiators, Darocur 1173 and lithium phenyl (2,4,6–trimethylbenzoyl) phosphinate (LAP), with significantly different UV absorption properties were evaluated based on the synthesis of magnetic hydrogels. The magnetic characteristics of the PEG-stabilized MNPs in hydrogels were investigated with a vibrating sample magnetometer. Finally, the colorimetric detection of hydrogen peroxide and glucose was conducted based on the enzyme-like property of MNPs and repeated several times to observe the catalytic activity of the magnetic hydrogels.

scholarly journals A Highly Sensitive and Selective Probe for the Colorimetric Detection of Mn(II) Based on the Antioxidative Selenium and Nitrogen Co-Doped Carbon Quantum Dots and ABTS•+

2021 ◽  
Vol 9 ◽  
Author(s):  
Qinhai Xu ◽  
Xiaolin Liu ◽  
Yanglin Jiang ◽  
Peng Wang
Keyword(s):  
Quantum Dots ◽  
Citric Acid ◽  
Detection Limit ◽  
Sodium Selenite ◽  
Tap Water ◽  
Colorimetric Detection ◽  
Carbon Quantum Dots ◽  
Promising Tool ◽  
Highly Sensitive ◽  
Co Doped

Herein, selenium and nitrogen co-doped carbon quantum dots (Se/N-CQDs) were hydrothermally synthesized by using citric acid, histidine, and sodium selenite, which had sp3 and sp2 hybridized carbon atoms and showed excitation-dependent fluorescence behavior. Furthermore, due to the redox reaction of ABTS•+ and Se/N-CQDs, Se/N-CQDs had the excellent antioxidant capacity that it was demonstrated by scavenging ABTS•+ with the fading of blue. Based on the synergistic effect of Se/N-CQDs and Mn(II) on ABTS•+, Se/N-CQDs and ABTS•+, as a stable, sensitive, selective, and reproducible colorimetric sensor, was applied to the detection of Mn(II) with a detection limit of 1.69 μM and a linear range of 0 to 142.90 μM. More importantly, the probe was successfully applied to detecting Mn(II) in tap water, illustrating that it could be a promising tool for Mn(II) detection in water environments.

Sign in / Sign up

Export Citation Format

Share Document