Voltammetric Sensor Modified by EDTA-immobilized Graphene-like Carbon Nitride Nanosheets: Preparation, Characterization and Selective Determination of Ultra-Trace Pb (II) in Water Samples

2016 ◽  
Vol 212 ◽  
pp. 722-733 ◽  
Author(s):  
Zhenyuan Teng ◽  
Hongying Lv ◽  
Luona Wang ◽  
Lin Liu ◽  
Chengyin Wang ◽  
...  
Keyword(s):  
Water Samples ◽  
Carbon Nitride ◽  
Voltammetric Sensor ◽  
Selective Determination ◽  
Ultra Trace ◽  
Carbon Nitride Nanosheets

scholarly journals Determination of ultra-trace levels of palladium in water samples by cloud point extraction and graphite furnace atomic absorption spectrometry

2021 ◽  
pp. 174751982110273
Author(s):  
Quan Han ◽  
Yanyan Huo ◽  
Xiaohui Yang ◽  
Xing Yao
Keyword(s):  
Water Samples ◽  
Cloud Point Extraction ◽  
Graphite Furnace ◽  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Graphite Furnace Atomic Absorption ◽  
Ultra Trace ◽  
Triton X ◽  
Optimized Conditions

A highly sensitive method for the determination of ultra-trace levels of palladium in water samples by cloud point extraction and graphite furnace atomic absorption spectrometry is developed. The procedure is based on complexation of palladium with a laboratory-prepared novel chelating agent, 2-(5-bromo-4-methyl-2-pyridylazo)-5-dimethylaminoaniline (5-Br-4-CH3-PADMA) and subsequent micelle-mediated extraction of the product using the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) as an extracting agent. Analytical parameters affecting the separation and detection process, such as pH, concentration of the chelating agent and surfactant, equilibration temperature, and time are investigated. The optimized conditions are as follows: pH 6.0 HAc–NaAc buffer solution, 1 × 10−5 mol L−1 5-Br-4-CH3-PADMA, and 0.1% (w/v) Triton X-114. Under the optimized conditions, the calibration graph is linear in the range of 0.1–12 ng/mL, the detection limit is 0.05 ng/mL for palladium, and the relative standard deviation is 2.9% ( c = 1.0 ng/mL, n = 10). The enrichment factor, defined as the ratio of the aqueous solution volume to that of the surfactant-rich phase volume after dilution with HNO3–methanol solution, is 200. The proposed method is applied to the determination of palladium in water samples with satisfactory results.

Fast, sensitive and selective determination of herbicide glyphosate in water samples with a White Light Reflectance Spectroscopy immunosensor

Talanta ◽  
2020 ◽  
Vol 214 ◽  
pp. 120854 ◽  
Author(s):  
Eleftheria Stavra ◽  
Panagiota S. Petrou ◽  
Georgios Koukouvinos ◽  
Anastasios Economou ◽  
Dimitris Goustouridis ◽  
...  
Keyword(s):  
White Light ◽  
Water Samples ◽  
Reflectance Spectroscopy ◽  
Selective Determination ◽  
Light Reflectance ◽  
Herbicide Glyphosate

Development of Molecularly Imprinted Membranes for Selective Determination of Urinary Ultra-Trace 5-Fluorouracil as Antineoplastic Drug Used in Chemotherapy

2020 ◽  
Vol 28 (4) ◽  
pp. 390-399
Author(s):  
Zahra Beigzadeh ◽  
Farideh Golbabaei ◽  
Monireh Khadem ◽  
Fariborz Omidi ◽  
Mirghani Seyed Someah ◽  
...  
Keyword(s):  
Antineoplastic Drug ◽  
Molecularly Imprinted ◽  
Selective Determination ◽  
Ultra Trace
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