摘要：
A novel method was investigated using chemically pretreated orange peel (POP) powder to separate and pre-concentrate Cr(III)) in environmental water. In this study, the raw orange peel was pretreated with petroleum ether-NaOH and employed as selective sorbent for the separation of Cr(III) ions in the presence of Cr(VD. The influences of pH, sample flow rate, elution concentration and volume, and breakthrough volume were investigated in detail. Cr(III) was selectively adsorbed on the micro-column packed with POP in the pH range from 3.5 to 5.5, while the unretained Cr(VI) was determined directly in the effluent. The retained Cr(III) was eluted with 2.0 mL of 1.2 mol L-1 HNO3 followed by determination with ICP-MS. Under the optimum conditions, the detection limits based on 3 sigma criterion were 0.009 ng m(-1) and 0.037 ng mL(-1) for Cr(III) and Cr(VD, respectively. The relative standard deviations (RSD) were less than 4.1% (n=11, c=2.0 ng The proposed method was successfully applied to the speciation determination of Cr(III) and Cr(VI) in water samples. The recoveries in spiked environmental water samples ranged from 98.5% to 103.8%. A reference water sample GBW(E)080642 was also analyzed and the results were in good agreement with the certified values.
关键词：
Diaphragm valve large-sized bag filter jetting performance
摘要：
The diaphragm valve is the key component of the deashing device in a pulse bag filter. It affects the investment cost, operation cost and the floor area, as well as the wide application of the dust removers on jetting performance directly. The development of a low pressure valve with a diameter of 100 was optimized by orthogonal test. The large-sized low-pressure diaphragm valve with the jetting and technical economic performance has been widespread used in market, it was better than small-sized one by parameter comparison between another similar one, the valve body resistance is decreased with the rise of diameter.
作者机构：
[万晶; 刘旭红; 胡纯] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[钟乐乐; 龚文琪; 李育彪; 辛桢凯] School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
通讯机构：
[Hu, C.] S;School of Chemical and Environmental Engineering, Wuhan Polytechnic University, China
会议名称：
14th International Conference on Electronic Packaging Technology (ICEPT)
会议时间：
AUG 11-14, 2013
会议地点：
Chinese Inst Elect, Dalian, PEOPLES R CHINA
会议主办单位：
Chinese Inst Elect
关键词：
radio frequency identification;anisotropic conductive paste;flip-chip;reliability
摘要：
In this work, an ACP was prepared and applied in the packaging of the RFID tag inlays through flip-chip bonding process. The shear strength, the radio frequency performances (Resonance Frequency and Scattering parameters--S11) before and after the aging tests (high humidity and temperature test, 85 degrees C, RH 85%) and the Maximum Read Distance of the prepared RFID tag inlays were used to evaluate their reliabilities. And the results were compared with those of RFID tag inlays packaged with a commercial ACP under the same bonding conditions. It was found that the radio frequency performance of the High Frequency RFID tag inlays packaged with the ACP prepared here and the commercial ACP, almost were identical and remained unchanged after the aging test. And the shear strengths of them both increased after the aging test. It was revealed that the ACP prepared here has the same performance of the commercial product. The prepared ACP maybe performed better than the commercial product from the relationships between the maximum read distances of the UtraHigh Frequency RFID tag inlays and the aging hours. It can be concluded that the preapared ACP can be applied in the RFID tag inlays assembling industry. It is another choice for the RFID tag manufactures. And this test system can also be used to evaluate the reliability of the RFID tag inlays.
摘要：
In this paper, titanium dioxide nanotubes (TDNTs) were used as a new solid phase extraction adsorbent for on-line separation and preconcentration of inorganic arsenic species [As(III) and As(V)] prior to the determination by inductively coupled plasma mass spectrometry (ICPMS). The experimental results showed that in the pH range of 3.0-6.0, As(III) and As(V) were quantitatively retained on TDNTs. As(III) was only quantitatively adsorbed by TDNTs within the pH range of 6.0-10, while As(V) passed directly through the microcolumn without retention. Based on the facts mentioned above, a novel method was developed for the speciation of inorganic arsenic by determining total As and As(III) at the pH of 5.0 and 9.0, respectively; As(V) was obtained from the difference between them. The main factors affecting the separation and determination of the analytes were also examined in detail. Under the optimized conditions, the detection limit of this method was 0.0019 ng mL(-1) for As(III) with an enrichment factor of 75, and the relative standard deviation was 2.5% for As(III) (n=9, c=1.0 ng mL(-1)). This method was applied for the determination of inorganic arsenic species in environmental water samples in the recovery range of 95.5-102%. In order to verify the accuracy of the method, a certified reference water sample was analyzed with satisfactory results.
作者机构：
[Xiang Chen.Tu; Wei Yi.Dan; Kui Le.Jia; Jian Fen.Li] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China
通讯机构：
[Li, J.] S;School of Chemical and Environmental Engineering, Wuhan, Hubei, 430023, China
会议名称：
2012 2nd International Conference on Management, Manufacturing and Materials Engineering, ICMMM 2012
会议时间：
September 21, 2012 - September 23, 2012
会议地点：
Beijing, China
会议主办单位：
(1) School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China
摘要：
NiO nanoparticles were successfully prepared by decomposing the predecessor bis(glycinato)nickel(II)dihydrate in the presence of oleylamine and triphenylphosphine (TPP), and different approaches including Fourier transforms infrared spectrometry(FT-IR), X-ray diffraction(XRD) and transmission electron microscopy (TEM) were used to characterize the NiO nanoparticles. Meanwhile, the effects of TPP concentration and reaction time on the size and yield of NiO nanoparticles derived from precursors were thoroughly investigated in this paper. The analysis results indicated that the prepared NiO nanoparticles were found spherical in shape and demonstrated weak agglomeration. They had generally high purity and a fine crystal phase of cubic syngony. Furthermore, the effects of the TPP concentration and reaction time on the size and yield of NiO nanoparticles are very crucial, higher concentration of TPP would results in reduction of both the mean size and yield of NiO particles. However both yields and particles size of NiO nanoparticles continuously increased as increasing reaction time, after more than 60 minutes, the size and yield of NiO nanoparticles kept hardly change.
作者：
Cheng xianzhong;Hu cunjie;Tong zhongze;Hu shencai;Shao kun
作者机构：
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, P. R. China,;Department of Materials and Chemistry Engineering, Guilin University of Technology, Guilin, P. R. Ch;Scho
摘要：
A simple,inexpensive,and sensitive method was developed for the determination of inorganic arsenic species As (Ⅲ),As(Ⅴ) and total As in environmental water samples using multiwalled carbon nanotubes (MWCNTs) as solid phase extraction(SPE) adsorbents coupled with hydride generation atomic flourescence spectrometry ( HG - AFS).The procedure is based on selectively absorbance of the chelates of As(Ⅲ) - ammonium pyrrolidine dithiocarbamate (APDC) on the MWCNTs with a pH range of 0.5 ～ 4.0,while As (Ⅴ) was passed through the microcolumn without the retention due to the preconcentration efficiency of As(Ⅴ) -APDC complex was very low and changed a litter.The retention complexs of As(Ⅲ) -APDC was eluted completely with 3 mL of 2.0 mol · L-1 HCl solution at a flow rate 1.0 mL · min - 1,and then directly determined by HG - AFS.The effluent of As(Ⅴ) was determined using thiourea and ascorbic acid as reducing agent for reduce As(Ⅴ) to As(Ⅲ).Total arsenic was determined after acid digestion with HCl∶ HNO3 (3 ∶ 1 ) in open vessel,and then the mixture solution of thiourea and ascorbic acid were added in the digestion solution for reducing As (Ⅴ) to As (Ⅲ).The different parameters that control the preconcention/separation step of As(Ⅲ) and As(Ⅴ) and determination have been investigated in detail.Under the optimized conditions,the detection limits of this method for As (Ⅲ) were 0.0062 ng · mL-1 with an enrichment factor of 27,and the relative standard deviations for As(Ⅲ) and As(Ⅴ) were 0.46％ ～ 6.30％.The proposed method was applied for the analysis of inorganic arsenic species in groundwater and lake water with the recovery of 96.8 - 102.8％.
