Determination of Trace Nickel in Water Samples by Graphite Furnace Atomic Absorption Spectrometry after Mixed Micelle-Mediated Cloud Point Extraction

Abstract

A simple and sensitive cloud point extraction method for the preconcentration of ultra-trace amounts of nickel as a prior step to its determination by graphite furnace atomic absorption spectrometry was proposed. It is based on the reaction of nickel with 2-(5-bromo-2-pyridylazo)-5-dimethylaminoaniline (5-Br-PADMA) in HAc–NaAc buffer media and mixed micelle-mediated extraction of the complex using the anionic surfactant sodium dodecyl sulfate sodium (SDS) and non-ionic surfactant (1,1,3,3-Tetramethylbutyl)phenyl-polyethylene (Triton X-114). The optimal reaction and extraction conditions such as pH, concentration of 5-Br-PADMA, SDS and Triton X-114, equilibrium temperature, incubation, and centrifuge time were evaluated and optimized. Under the optimal conditions, the calibration graph was linear over the range 0.1–5.5 ng/mL of nickel with a correlation coefficient of 0.9942. The detection limit obtained was 0.031 ng/mL, and the relative standard deviation was 2.1% for nickel (c = 2 ng/mL, n = 6). The proposed method was successfully applied to the determination of nickel in water samples.

Nanocomposites for Electrochemical Sensors and Their Applications on the Detection of Trace Metals in Environmental Water Samples

“…Traditional methods for the detection and monitoring of trace metals in water bodies include, but are not limited to, spectrometric techniques such as; inductively coupled plasma-optical emission spectrometry (ICP-OES) [ 6 ], inductively coupled plasma-mass spectrometry (ICP-MS) [ 12 ], flame atomic absorption spectroscopy (FAAS) [ 13 ], graphite furnace atomic absorption spectroscopy (GFAAS) [ 14 ] and x-ray fluorescence (XRF) [ 15 ]. However, these techniques require sample collection, sample pre-treatment, high energy input, pure gas input, infrastructure and skilled engineers, scientists, or technicians to operate the instruments [ 6 , 12 , 13 , 14 , 15 , 16 ]. As an alternative to these techniques, electroanalytical devices, particularly electrochemical sensors, have been identified as potential candidates for the low cost, sensitive and selective detection of trace metals in environmental water bodies [ 17 , 18 , 19 ].…”

Simultaneous Determination of Six Isoflavones from Puerariae Lobatae Radix by CPE-HPLC and Effect of Puerarin on Tyrosinase Activity

“…Extractions based on such phenomenon are referred to as cloud point extractions (CPEs). Cloud-point extraction has been reported in many studies concerning the extraction and preconcentration of solutes from water [22], urine [23], and soil [24]. However, little was known about the use of surfactant solution as a solvent for the extraction of chemical constituents from herbal products [25,26].…”

Spatially resolved indiffusion behavior of Cu2+ and Ni2+ in polypropylene

“…Nickel-induced toxicities include genotoxicity, carcinogenicity, and immunotoxicity. [19,20] The general aim of this study is the spatially resolved investigation of metal ion diffusion in PP. Therefore, a time-of-flight secondary ion mass spectrometry (ToF-SIMS) based cryo-approach should be established.…”