قائمة الطعام
For a chemical evaluation of the magnetic separation, the separation efficiency parameter was determined using the Fe concentration. The results are shown in Table 2. Higher values were obtained for the 125–500 μm fraction than for the <125 μm fraction, which suggests that magnetic separation works better for the medium-size …
The separation process in nanofiltration (NF) membrane depends both on size sieving and Donnan exclusion, and efficiently rejects multivalent dissolved ions of …
Separation of arsenic and antimony from dust with high content of arsenic by a selective sulfidation roasting process using sulfur [J]. Transactions of Nonferrous Metals Society of China, 2018, 28: 1027âˆ'1035. [34] ZHONG Da-peng, LI Lei, TAN Cheng. Recovery of antimony from antimony-bearing dusts through reduction roasting process …
Therefore, the main objectives of this research were to: (1) used the synthetic water to evaluate the arsenic and antimony adsorption behaviors onto magnetic MnFe 2 O 4 particles; (2) developed a continuous pilot-scale adsorption combined with superconducting magnetic separation system and evaluated its feasibility to separate …
The separation of arsenic and antimony trioxides was realized principally based on their disparate saturated vapor pressures at specific temperature ranges and the asymmetric membrane of FeAl filter elements with a mean pore size of 1.8 μm. Pilot-scale filtration tests showed that the direct separation of arsenic and antimony can be …
The high separation of arsenic is due to the transformation from the limited vaporization of arsenate to volatile arsenic trioxide by pyrite at above 460 °C. Two reaction paths of pyrite were ...
Anion exchange, cation exchange, reversed-phase, ion pair, and size exclusion chromatography are useful to separate various arsenic species.
Abstract The accurate determination of arsenic species in waters is still an environmental challenge because of the rapid redox transformation of As. So, a procedure for on-site separation of As(III), As(V), methylarsonic acid, and dimethylarsinic acid in natural waters has been developed. The procedure involves passing a water sample …
A simple capillary zone electrophoresis procedure was developed for the separation of arsenic species (AsO (2) (2-), AsO (4) (2-), and dimethylarsinic acid, DMA). Both counter-electroosmotic and ...
Thermodynamic analysis of the As-Sb-O system indicated that if arsenic and antimony oxides behave like pure solid phases, then there is no limitation to producing pure antimony oxide by these proposed techniques. The selective volatilization experiments were carried out at 379 °C to 587 °C, using both nitrogen and air as carrier gases and an ...
The heavy metal contaminant arsenic exist in the form of arsenite (As(III)) and arsenate (As(V)) ions. These ions are highly carcinogenic that are usually present in the ground water. To date, most of the designed polymer inclusion membrane (PIM) involved only about separation without differentiating the oxidation states.
Xing et al. [25] investigated the role of O 2 in the real flue gas on selenium removal by CaO using DFT method. The results showed that the presence of O 2 on CaO (0 0 1) surface weakened the adsorption ability for both Se and SeO 2. Nevertheless, the mechanism of arsenic and selenium removal by CaO is not fully understood, especially …
Interestingly, recently emerging evidence has pointed out the pivotal roles of arsenic compounds in phase separation and membraneless organelles formation, which may decide their toxicity and therapeutic efficacy. Here, we summarized the arsenic compounds-regulating phase separation and membraneless organelles formation. We …
A high-performance liquid chromatography (HPLC) in combination with inductively coupled plasma mass spectrometry (ICP-MS) as an elemental specific …
The maximum removal of arsenic obtained is almost 100 percent and a minimum of 91 percent extraction at an initial intensity of 5-15 mg /L of arsenic with supply voltage in the 5-20 V range ...
Abstract. Separation of arsenic and valuable metals (Pb, Zn, Cu, Bi, Sn, In, Ag, Sb, etc.) is a core problem for effective utilization of high arsenic-containing copper …
Arsenate (AsO 4 3-) and Arsenite (AsO 3 3-) occur in water.Both Arsenate and Aresenite are anions. An anionic resin exchange would be used to extract Arsenic. Amberlite IRA 400 is perhaps a structure of polystyrene DVB strong base anion exchange resin that was seen in Fig. 1 and its features are shown in Table 1.Its overall Ion …
After the separation from water, arsenic species adsorbed on the ultrafine Mg 0.27 Fe 2.50 O 4 nanoadsorbent could be desorbed by washing with 2 M NaOH solution. Over 90% arsenic species could be desorbed, and the regenerated ultrafine Mg 0.27 Fe 2.50 O 4 nanoadsorbent could be reused for arsenic removal.
Efficient separation of arsenic compounds is a critical component of speciation analysis, whether it be for routine analysis of known arsenic compounds or for identification of unknown compounds. Optimal separation techniques depend on …
Given the high toxicity of arsenic (As) and the strategic importance of antimony (Sb), the separation of As and Sb has become a pivotal concern in the disposal of arsenic‑antimony flue dust and other arsenic‑antimony hazardous wastes.In this study, we propose a controlled roasting process employing anthracite and sulfuric acid …
Abstract. The predominant species of arsenic in ground water are probably arsenite and arsenate. These can be separated with a strong anion-exchange resin (Dowex 1 × 8; 100–200 mesh, acetate form) in a 10 cm × 7 mm column. Samples are filtered and acidified with concentrated hydrochloric acid (1 ml per 100 ml of sample) at the sample site.
Scheme for selective separation of the arsenic species by MRT gel SPE columns. At pH 5, As(V) and MMA were quantitatively retained in the TE-01 SPE column while As(III) and DMA remained in the column effluent. The captured species was eluted with HNO 3. The eluted solution was separated into two equal portions, and pH was …
The products of conventional and surfactant-assisted ball-. milling of magnetite powder were tested as potential arsenic. adsorbents able to be recovered by means of a low-field magnetic ...
This separation method was applied to arsenic species analysis in rice. The extraction of arsenic from rice samples was performed using 0.15M nitric acid. The methodology was validated by use of certified reference materials, NMIJ CRM 7503-a and NIST SRM 1568a, and extremely low arsenic rice samples as blank samples.
The selective separation of arsenic in the NaOH-S system from arsenic dust containing Pb, Sb, and Zn was studied by central composite design response …
Various separation techniques, including high performance liquid chromatography (HPLC), capillary electrophoresis (CE), and gas chromatography (GC), …
The Discovery HS F5 column with a pentafluorophenyl (PFP) stationary phase gave sharp peaks and full separation of the arsenic species in 5 min, and other PFP columns showed lower performance. This separation method was applied to arsenic species analysis in rice. The extraction of arsenic from rice samples was performed …
1. Introduction. Arsenic has several radioisotopes of interest for medical, biochemical and environmental applications. For this reason many radiochemical methods have been reported in the literature for arsenic separation which were summarized and categorized in a previous work (Oláh et al., 2015).In the present paper the semi …
Separation of organic and inorganic arsenic species by HPLC-ICP-MS. Conference contribution. Published: March 1999. Volume 363, pages 577–581, ( 1999 ) Cite this …
When classifying impurities in commercial pure antimony (Sb, 99.8%), arsenic (As) and lead (Pb) should be brought to the forefront consideration.
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