0086-21-58386256
In this study, the treatment of low-concentration Mo-containing solution by Fe3+ addition was investigated by batch experiment, and the effects of main parameters including …
The preconcentration of larger sample volumes at a defined sample flow rate improves the preconcentration factor of the SPE method [20]. In order to investigate the possibility of enriching low concentrations of analytes from large volumes, the maximum applicable sample volume must be determined.
A new simple and efficient homogeneous liquid–liquid extraction method for the selective separation and preconcentration of molybdenyl ions was developed. α-Benzoin oxime (ABO) was investigated as a complexing ligand, and perfluorooctanoate ion (PFOA −) was applied as a phase-separator agent under strongly acidic …
Molybdenum is a trace element in the earth's crust and the estimated abundance is in the range of 0.05–40 μg g −1 with a mean value of 1.5 μg g −1 [1]. Mo has seven naturally occurring isotopes, e.g. 92 Mo, 94 Mo, 95 Mo, 96 Mo, 97 Mo, 98 Mo and 100 Mo with relative abundances ranging from 9.2 to 24.2% [2]. World production of Mo ores …
The extraction efficiency was greater than 95% under ideal conditions for the concentrations strating from 0.09 to 60 µg mL −1 and a low detection limit (0.3 μg L - 1) with a preconcentration factor of 100. Moreover, by simply changing the pH of the aqueous phase, La(III) can be extracted with high selectivity from a variety of complicated ...
A new system for on-line preconcentration of molybdenum by sorption on a minicolumn associated to inductively coupled plasma — optical emission spectrometry with ultrasonic nebulization was studied.
The proposed procedure gives a simple, very sensitive and low-cost spectrophotometric procedure for determination of molybdenum ion that can be applied to real samples. The surfactant has been used for preconcentration of molybdenum in water, and thus toxic solvent extraction, has been avoided.
Various low-polarity adsorbents materials including have been used for the preconcetration or speciation of trace elements in different in aqueous samples prior to their quantification. ... Msagati TA, Moodley B (2013) Preconcentration of molybdenum, antimony and vanadium in gasolsine samples using Dowex 1-×8 resin and their …
low concentration of molybdenum together with the high concentration of interfering matrix components often requires a preconcentration step combined with a matrix ... suitable preconcentration procedure depends considerably on the analyte concentration and the measurement method for its final determination. Thus, many separation and pre- ...
A chelating resin is prepared by condensation polymerization of aniline with formaldehyde and characterized by Fourier transform infrared spectrometer, elemental analysis and thermogravimetric analysis and studied for the preconcentration and determination of trace Molybdate ion from environmental water sample using inductive …
Studies on pre-concentration of molybdenum values from a primary molybdenum ore deposit located in Harur of Dharmapuri district, Tamilnadu were carried out by physical beneficiation techniques. Inspite …
Distribution and preconcentration of critical elements from coal fly ash by integrated physical separations. International Journal of Coal Geology 2022, 261, 104095. ... The effect of caustic soda treatment to recover rare earth elements from secondary feedstocks with low concentrations. Minerals Engineering 2021, 173, 107184. …
Phosphate concentration in natural water has been used as a water quality indicator, as it is one of the major nutrients for aquatic plants. However, the traditional phosphomolybdenum blue (PMB) method has limited sensitivity for visual or camera-based detection, leading to underestimation of the phosphate concentration. We present an ultralow-cost, rapid field …
The method allows the determination of molybdenum in the 5.0×10−10 to 5.0×10−7 g ml−1 range with a limit of detection (3σ) of 5×10−11 g ml−1 molybdenum.
Cloud point extraction (CPE) was used for the preconcentration of molybdenum (Mo), after the formation of a complex with Victoria pure blue BO (VPB+) in presence of excess thiocyanate and ...
Low amounts of molybdenum are necessary element, but it can be toxic for plants, animal, or human at higher amounts (Kara & Karadas, 2015). It may cause gastroenterological disorders and cardiac failure (Snigur, Chebotarev, Dubovyiy, Barbalat, & Bevziuk, 2018). The other important molybdenum source is drinking water. ...
Molybdenum, due to its high boiling point and high melting point, is an important non-renewable strategic resource for developing new and high-tech technologies [1,2,3].Molybdenite (MoS 2) concentrate is the material to produce molybdenum in industry, and it is usually processed by pyrometallurgy [4,5,6].In the process of pyrometallurgy, …
The proposed preconcentration and separation procedure can also be applied to determination of trace molybdenum in various biological samples. Selectivity of the method was increased by a preconcentration procedure in the low pH range of 2.5–3.5. The validity of the procedure was confirmed by recoveries of Mo spiked to the …
For liquid milk samples, a procedure was proposed based on preconcentration and removal of the matrix, using ionic exchange (Amberlite IRA 743) and elution of molybdenum with 5% (m/v) NaOH. In this case, a 30-fold improvement in the calibration slope was achieved, leading to a detection limit of 0.04 microg L(-1) for liquid …
The concentration of molybdenum in solution after precipitation of AMP was lower than 300 µg ml−1. ... This preconcentration process is very efficient ... Kirkham RJ, Bennett RG (2000) Advances in sublimation separation of technetium from low-specific-activity molybdenum-99. Ind Eng Chem Res 39:3157–3168. Article CAS Google Scholar ...
Chapter5 Preconcentration of environmental samples 5.1 INTRODUCTION Preconcentration procedures are especially relevant to environmental samples. Preconcentration is essentially an interference removal tech nique. The need to preconcentrate samples arises from the low sensitivity and poor selectivity of analytical …
Rats fed a diet low in molybdenum had higher serum uric acid levels than those given added molybdenum. There is evidence that dental cavities may be prevented by a high intake of molybdenum.
Molybdenum (Mo) Nickel (Ni) Phosphorus (P) ... preconcentration of the sample may be required prior to analysis in order to meet drinking water acceptance performance criteria (Sections 11.2.2 through ... Therefore, low recoveries of silver may occur in samples, fortified sample ...
Limit of detection, preconcentration factor and sorbent capacity of PMaema were equal to 3.3 ng L−1, 100 and 75.8 mg g−1, respectively. ... species in water samples by molybdenum blue method ...
Separation and preconcentration methods have also been utilised in other determination techniques. Spectrophotometric methods which are widely used for the determination of the elements in a large variety of inorganic materials are presented in the book whilst separation and preconcentration procedures combined with …
The precision of the preconcentration method, calculated as the relative standard deviation by using 50.0 μg l−1 molybdenum solutions, was 2.21 and 2.89%, regarding repeatability and ...
In this study, the treatment of low-concentration Mo-containing solution by Fe 3+ addition was investigated by batch experiment, and the effects of main parameters …
Under the optimum conditions, the detection limit (3σ) was 17.7μgL (-1) for molybdenum without any preconcentration. The precision was determined from 30 results obtained for 4.80μgmL (-1) Mo ...
The proposed preconcentration procedure was applied to determine Mo in biological samples such as vegetables, milk, and animal liver. The molybdenum concentrations …
Cloud point extraction (CPE) was used for the preconcentration of molybdenum (Mo), after the formation of a complex with Victoria pure blue BO (VPB+) …
The concentration of molybdenum is too low to be directly determined with these technique in well water, tap water [11], seawater samples [12], etc. …
A new hybrid nanomaterial is used in a screen-printed electrode (SPE) for sensing of the ortho-diphenols oleuropein (OLEU) and hydroxytyrosol (HYT) in extra olive oil (EVOO) and related samples. The hybrid material consists of carbon black (CB) and molybdenum disulfide (MoS2). In comparison with individual nanomaterials, CB-MoS2 …
Molybdenum deficiency is closely related to nitrogen deficiency. When the pH of growing media moves towards the acidic region, the availability of Mo gets lower. The fungi assisted green synthesis is more efficient as they release enzymes that catalyze the conversion of carcinogenic metallic ions into metal and metal oxide based nanostructures.
This paper reports a new method for preconcentration and separation of trace amounts of molybdenum in seawater samples prior to determination by inductively coupled plasma–atomic emission spectroscopy (ICP–OES). Diethylenetriaminetetraacetic acid-functionalized polysiloxane (DETAP) was synthesized by carboxymethylation of …
Molybdenum concentration is usually very low in environmental samples and the sample matrix may cause serious interferences during measurement. Preconcentration and separation methods are needed to solve these problems and render more sensitive, accurate and interference-free determination. Recent developments in sample treatment …