scholarly journals Facile and Green Fabrication of Carrageenan-Silver Nanoparticles for Colorimetric Determination of Cu2+ and S2−

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 83 ◽  
Author(s):  
Yesheng Wang ◽  
Xueyi Dong ◽  
Li Zhao ◽  
Yun Xue ◽  
Xihui Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Lake Water ◽  
Color Change ◽  
Tap Water ◽  
Environmental Water ◽  
Colorimetric Determination ◽  
Capping Agent ◽  
Colorimetric Sensing ◽  
Green Method

In the present work, silver nanoparticles (AgNPs) were prepared by a simple and green method using carrageenan as reducing and capping agent. The as-synthesized carrageenan-AgNPs was demonstrated as an effective duel colorimetric sensing for selective and sensitive recognition of Cu2+ and S2−, which could be used to detect these ions with naked eyes. In addition, the possible sensing mechanism was that Cu2+ ions caused serious aggregation of carrageenan-AgNPs, which led to the color change of carrageenan-AgNPs. AgNPs were etched by S2− forming Ag2S, which played an important role in the determination of S2− ions. Furthermore, it has been successfully applied to the determination of Cu2+ and S2− in tap water and lake water, showing its great potential for the analysis of environmental water samples.

Simultaneous Determination of Triclocarban and Triclosan in Environmental Water by Using SPE Combined with HPLC-ESI-MS

2012 ◽  
Vol 610-613 ◽  
pp. 268-271 ◽  
Author(s):  
Chun Liang Yi ◽  
Wei Lin Guo ◽  
Xi Kui Wang
Keyword(s):  
Simultaneous Determination ◽  
Lake Water ◽  
Tap Water ◽  
Environmental Water ◽  
Optimum Conditions ◽  
Operational Parameters ◽  
Esi Ms ◽  
Water Lake ◽  
Sensitive Method

A sensitive method for the simultaneous determination of TCC and TCS in water, which involves enrichment with SPE and detection with HPLC-ESI-MS, was developed. The influence of the operational parameters,such as eluan, the acidity of the sample, were investigated and optimized. Under the optimum conditions, the limits of detection were 1.0 ng L-1and 2.5 ng L-1 for TCC and TCS, respectively. The method was successfully applied to the analysis of triclocarban and triclosan in real environmental water samples, including river water, lake water and tap-water. The spiked recoveries of TCC and TCS in these samples were achieved in the range of 89.5%–97.5%.

scholarly journals Colorimetric Determination of Hypochlorite Based on the Oxidative Leaching of Gold Nanorods

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1629 ◽  
Author(s):  
Yurong Ma ◽  
Yingyi Zhu ◽  
Benzhi Liu ◽  
Guixiang Quan ◽  
Liqiang Cui
Keyword(s):  
Gold Nanorods ◽  
Color Change ◽  
Colorimetric Assay ◽  
Tap Water ◽  
Critical Role ◽  
Colorimetric Method ◽  
Residual Chlorine ◽  
Colorimetric Determination ◽  
Oxidative Leaching

Hypochlorite plays a critical role in killing microorganisms in the water. However, it can also cause cardiovascular diseases, neuron degeneration, and cancer to humans. Although traditional methods feature excellent sensitivity and reliability in detecting hypochlorite, the expensive instruments and strict determination conditions have limited their application in environmental analysis to some extent. Thus, it is necessary and urgent to propose a cheap, facile, and quick analytical assay for hypochlorite. This paper proposes a colorimetric assay for hypochlorite utilizing gold nanorods (AuNRs) as the nanoreactor and color reader. The AuNRs were acquired via a reported seed-mediated method. NaClO with strong oxidation property can cause the etching of gold from the longitudinal tips of AuNRs, which could shorten the aspect ratio of AuNRs, decrease the absorption in the UV–Vis spectrum and also induce the solution color changing from red to pale yellow. Thus, according to the solution color change and the absorbance of longitudinal surface plasmon resonance of AuNRs, we established the calibration curve of NaClO within 0.08 μM to 125 μM (∆Abs = 0.0547 + 0.004 CNaClO, R2 = 0.9631). Compared to traditional method, we obtained the conversion formula between the concentration of residual-chlorine in tap water and the concentration of hypochlorite detected by the proposed colorimetric assay, which is Cresidual-chlorine = 0.24 CNaClO. Finally, the real application of the colorimetric assay in tap water was successfully performed, and the accuracy of the colorimetric method can reach from −6.78% to +8.53%.

scholarly journals Determination of OCPs and PCBs in environmental water samples by GC-DLLME optimized by Response Surface Methodology

2019 ◽  
Vol 20 (46) ◽  
pp. 13-23
Author(s):  
Dekun Hou ◽  
Otgonbayar Khureldavaa ◽  
Fujin Zhang ◽  
Jiang He ◽  
Badgaa Amarsanaa
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Lake Water ◽  
Water Samples ◽  
Tap Water ◽  
Environmental Water ◽  
Enrichment Factors ◽  
Environmental Water Samples ◽  
Relative Standard

A new sample preparation procedure to determine seven organochlorine pesticides and seven polychlorinated biphenyls in environmental water samples by using a combination of ultrasonic-assisted solvent extraction and dispersive liquid-liquid micro-extraction was established, and the extracted analytes were analyzed by gas chromatography coupled with electron capture detector. Some parameters influencing the extraction efficiency were studied and optimized utilizing response surface methodology. Under the optimum extraction conditions, the method showed wide linear ranges with r2 > 0.9989 and low limits of detection and quantification between 0.16 ~ 2.17 μg/L and 0.53 ~ 7.16 μg/L, respectively. Enrichment factors (EF) were high and ranged from 63 to 116. Relative standard deviations (RSDs) for the extraction of 25 μg/L of each selected OCPs and PCBs were less than 10.2 %. The proposed method was successfully used for targets contaminations determination in different water samples. α-HCH, β-HCH and p,p’-DDE were found in lake water closed to farmland with concentrations of 2.56 μg/L, 4.44 μg/L and 4.74 μg/L, respectively, and other OCPs and PCBs were not found in the corresponding water samples. The relative recoveries of OCPs and PCBs from tap water, river water and lake water at spiking levels of 10 μg/L were in the range of 81.9 ~ 109.7 %, within a relative standard deviation of 1.7 ~ 11.8 %. The results revealed that the proposed method was well suited for the determination of trace amounts of target contaminations in liquid samples.

Visual and colorimetric determination of H2O2 and glucose based on citrate-promoted H2O2 sculpturing of silver nanoparticles

2018 ◽  
Vol 185 (3) ◽  
Author(s):  
Chenghua Zong ◽  
Bo Li ◽  
Jing Wang ◽  
Xiaojun Liu ◽  
Wenfeng Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Colorimetric Determination

scholarly journals Chlortetracycline-Functionalized Silver Nanoparticles as a Colorimetric Probe for Aminoglycosides: Ultrasensitive Determination of Kanamycin and Streptomycin

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 997 ◽  
Author(s):  
Ganesh Dattatraya Saratale ◽  
Rijuta Ganesh Saratale ◽  
Gajanan Ghodake ◽  
Surendra Shinde ◽  
Dae-Young Kim ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Color Change ◽  
Limit Of Detection ◽  
Colorimetric Assay ◽  
Uv Spectroscopy ◽  
Aminoglycoside Antibiotics ◽  
Sensing Element ◽  
Colorimetric Probe ◽  
Aqueous Conditions

Aminoglycosides (AMGs) have been extensively used to treat infectious diseases caused by Gram-negative bacteria in livestock and humans. A selective and sensitive colorimetric probe for the determination of streptomycin and kanamycin was proposed based on chlortetracycline-coated silver nanoparticles (AgNPs–CTC) as the sensing element. Almost all of the tested aminoglycoside antibiotics can rapidly induce the aggregation of AgNPs, along with a color change from yellow to orange/red. The selective detection of aminoglycoside antibiotics, including tobramycin, streptomycin, amikacin, gentamicin, neomycin, and kanamycin, with other types of antibiotics, can be achieved by ultraviolet (UV) spectroscopy. This developed colorimetric assay has ability to detect various AMGs using in-depth surface plasmon resonance (SPR) studies. With this determination of streptomycin and kanamycin was achieved at the picomolar level (pM) by using a UV–visible spectrophotometer. Under aqueous conditions, the linear range of the colorimetric sensor for streptomycin and kanamycin was 1000–1,1000 and 120–480 pM, respectively. The corresponding limit of detection was 2000 pM and 120 pM, respectively. Thus, the validated dual colorimetric and ratiometric method can find various analytical applications for the ultrasensitive and rapid detection of AMG antibiotics in water samples.

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