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Effectiveness of ZnO Nano Particles against the Foodborne Microbial Pathogens E. coli and S. aureus 氧化锌纳米颗粒对食源性病原菌大肠杆菌和金黄色葡萄球菌的抑制作用
IF 0.4 Pub Date : 2020-08-26 DOI: 10.47014/15.2.4
Khaled Saif Aldin, S. Al-Hariri, Adnan Ali-Nizam
In this work, various concentrations of ZnO nano particles, prepared by the coprecipitation method with a size range of 47-68 nm, have been investigated as antimicrobial agents. Dilution antimicrobial susceptibility tests were carried out on two kinds of microbes (Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli) according to the standard method recommended by Clinical and Laboratory Standards Institute, CLSI-2015-M07-A10. The results showed that the antimicrobial effect is larger, the higher the concentration of ZnO nano particles in solution. It was also found that Gram-positive microbes are more sensitive to ZnO nano particles when compared with the Gram-negative ones. The minimum inhibitory concentration (MIC) for E. coli was found to be 50 mg/mL while that for S. aureus was 25 mg/mL. The minimum bactericidal concentration (MBC) was 1600 mg/mL for E. coli and 800 mg/mL for S. aureus.
本文研究了用共沉淀法制备的不同浓度的ZnO纳米颗粒(粒径范围为47 ~ 68 nm)作为抗菌药物。按照临床与实验室标准协会CLSI-2015-M07-A10推荐的标准方法,对革兰氏阳性金黄色葡萄球菌和革兰氏阴性大肠杆菌两种微生物进行稀释药敏试验。结果表明,溶液中ZnO纳米颗粒浓度越高,抑菌效果越明显。同时发现革兰氏阳性菌对ZnO纳米粒子的敏感性高于革兰氏阴性菌。对大肠杆菌最低抑菌浓度为50 mg/mL,对金黄色葡萄球菌最低抑菌浓度为25 mg/mL。最低杀菌浓度(MBC)对大肠杆菌为1600 mg/mL,对金黄色葡萄球菌为800 mg/mL。
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引用次数: 2
Synthesis of Some Pyrazole Derivatives from 5-Chloro- and 5-Azido-1,3-diphenyl-1H-pyrazole-4-carbaldehydes 5-氯和5-叠氮-1,3-二苯基- 1h -吡唑-4-乙醛衍生物的合成
IF 0.4 Pub Date : 2020-08-04 DOI: 10.47014/15.1.4
M. Farhat
N-[(5-Azido-1,3-diphenyl-1H-pyrazole-4-yl)methylene]-N-arylamines (4a-c) and N-[(5-Substituted-1,3-diphenyl-1H-pyrazole-4-yl)methylene]hydrazides (5a-e) were prepared from 5-azido-1,3-diphenyl-1H-pyrazole-4-carbaldehyde (3) and 5-chloro-1,3-diphenyl-1H-pyrazole-4-carbaldehyde (2), respectively. Thermolysis of (4a-c) and (5d-e) afforded 5-arylamino-1,3-diphenyl-1H-pyrazol-4-carbonitriles (8a-c) and N-(4-cyano-1,3-diphenyl-1H-pyrazol-5-yl)hydrazides (13a,b), respectively. N-[2-(5-Chloro-1,3-diphenyl-1H-pyrazol-4-yl)-4-oxo-thiazolidin-3-yl]amides (14a,b) and 3-acetyl-2-(5-chloro-1,3-diphenyl-1H-pyrazol-4-yl)-5-aryl-2,3-dihydro-1,3,4-oxadiazoles (15a,b) were obtained from N-[(5-chloro-1,3-diphenyl-1H-pyrazole-4-yl)methylene]hydrazides (5a,b). 5-Azido-1,3-diphenyl-1H-pyrazol-4-carbaldehyde (3) gave unexpectedly 1-(1,3-diphenyl-1,6-dihydropyrrolo-2,3-c]pyrazol-5-yl)ethan-1-one (17).
以5-叠氮-1,3-二苯基- 1h -吡唑-4-基)甲醛(3)和5-氯-1,3-二苯基- 1h -吡唑-4-醛(2)为原料,分别制备了N-[(5-叠氮-1,3-二苯基- 1h -吡唑-4-基)亚甲基]-N-芳胺(4a-c)和N-[(5-取代-1,3-二苯基- 1h -4-基)亚甲基]肼(5a-e)。(4a-c)和(5d-e)热解得到5-芳胺-1,3-二苯基- 1h -吡唑-4-碳腈(8a-c)和N-(4-氰基-1,3-二苯基- 1h -吡唑-5-基)肼(13a,b)。由N-[(5-氯-1,3-二苯基- 1h -吡唑-4-基)亚甲基]肼(5a,b)得到N-[2-(5-氯-1,3-二苯基- 1h -吡唑-4-基)-4-氧-噻唑-3-基]酰胺(14a,b)和3-乙酰基-2-(5-氯-1,3-二苯基- 1h -吡唑-4-基)-5-芳基-2,3-二氢-1,3,4-恶二唑(15a,b)。5-叠氮-1,3-二苯基- 1h -吡唑-4-甲醛(3)意外地得到1-(1,3-二苯基-1,6-二氢吡咯-2,3-c]吡唑-5-基)乙比-1- 1(17)。
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引用次数: 0
Removal of Pb(II), Zn(II), Sn(II) and Cu(II) Ions from Aqueous Solutions by Linear Alternating Poly(4,4'-biphenol oxalate) Oligomer 线性交替聚(4,4'-二苯酚草酸盐)低聚物去除水溶液中的Pb(II)、Zn(II),Sn(II)和Cu(II)离子
IF 0.4 Pub Date : 2020-08-01 DOI: 10.47014/15.2.3
Poly(4,4′-biphenol oxalate) oligomer was synthesized and characterized by FT-IR, elemental analysis XRD and thermal analysis. The capability of the oligomer to take away Pb(II), Zn(II), Sn(II) and Cu(II) metal ions from aqueous solutions was considered by the known batch and column techniques in terms of concentration, pH value, contact time and temperature. The results indicated that a high initial rate of metal-ion uptake by the oligomer was observed throughout the first 30 minutes, which enlarged slightly amid rising the pH value and then reached its greatest value at pH=5.00 for Pb(II) and Zn(II), pH=4.00 for Cu(II) and pH=6.00 for Sn(II). The oligomer exhibited a high metal-ion uptake capacity to Pb(II) and Zn(II), but a little metal-ion uptake capacity to Cu(II) and Sn(II). Linearized forms of the Langmuir, Freundlich and Dubinin–Radushkevich adsorption isotherms were used to investigate the experimental equilibrium concentration data of Pb(II), Zn(II), Cu(II) and Sn(II). ΔG values demonstrated that the adsorption process of these metal ions on the oligomer is favored while the ΔH values indicated that this process is endothermic. On the other hand, the entropy of the process is positive. In addition to batch experiments, column experiments were performed, where the metal ions were efficiently recovered by treatment of the metal-loaded oligomer with 1.0 M HNO3, 1.0 M HCl and 0.5 M EDTA. The best results were obtained with 1.0 M HNO3 solution.
合成了聚(4,4′-双酚草酸酯)低聚物,并用FT-IR、元素分析、XRD和热分析对其进行了表征。该低聚物从水溶液中带走Pb(II)、Zn(II)、Sn(II)和Cu(II)金属离子的能力通过已知的批处理和柱处理技术在浓度、pH值、接触时间和温度方面进行了考察。结果表明:低聚物对金属离子的初始吸收速率在前30分钟内都很高,随着pH值的升高,低聚物对金属离子的吸收速率略有增大,在Pb(II)和Zn(II)的pH=5.00、Cu(II)的pH=4.00和Sn(II)的pH=6.00时达到最大。该低聚物对Pb(II)和Zn(II)具有较高的金属离子吸收能力,对Cu(II)和Sn(II)的金属离子吸收能力较弱。采用Langmuir、Freundlich和Dubinin-Radushkevich吸附等温线的线性化形式研究了Pb(II)、Zn(II)、Cu(II)和Sn(II)的实验平衡浓度数据。ΔG值表明这些金属离子在低聚物上的吸附过程是有利的,而ΔH值表明这一过程是吸热的。另一方面,这个过程的熵是正的。除批量实验外,还进行了柱状实验,用1.0 M HNO3、1.0 M HCl和0.5 M EDTA处理负载金属的低聚物,有效地回收了金属离子。以1.0 M的HNO3溶液效果最好。
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引用次数: 0
Electrical Characterization of E7 Liquid Crystal Molecules under the Impact of an External Electric Field (THz): A Theoretical approach 外电场(THz)作用下E7液晶分子的电特性:一个理论方法
IF 0.4 Pub Date : 2020-08-01 DOI: 10.47014/15.2.5
Narinder Kumar, Bhavna Pal, Pawan Singh, K. Thapa, Devendra Singh
In this work, different parameters of E7 liquid crystal (LC) have been calculated under the influence of an electric field in THz frequency. The E7 LC parameters have positive as well as negative values of order parameter and birefringence under the influence for an electric field. The director angle of E7 LC shows fast fluctuations above the angle θ=45° and due to rapid change in the orientation of molecules, fast electro-optical switching devices based on E7 LC can be designed. The refractive index of the E7 LC maintains stability in THz frequency.
在太赫兹频率的电场影响下,计算了E7液晶(LC)的不同参数。在电场的影响下,E7 LC参数的阶参量和双折射率均为正值和负值。E7 LC的指向角在θ=45°以上呈快速波动,由于分子取向的快速变化,可以设计基于E7 LC的快速电光开关器件。E7 LC的折射率在太赫兹频率内保持稳定。
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引用次数: 0
Evaluation of Chitosan Modified by Sodium Dodecyl Sulfate for Removing Hexavalent Chromium from Aqueous Solutions 十二烷基硫酸钠改性壳聚糖去除六价铬的性能评价
IF 0.4 Pub Date : 2020-03-01 DOI: 10.47014/15.1.2
Ahmad Al Shra’ah
Hexavalent chromium (Cr(VI)) has the characteristic of forming anionic species, which are very toxic, very soluble in water and difficult to be removed. In this study, dichromate removal from aqueous solutions by chitosan and chitosan modified by sodium dodecyl sulfate (SDS) was addressed. The effect of various experimental parameters, such as pH (1-9), initial concentration (10-100 mg L-1), adsorbent dose (0.005-0.350 g) and contact time (5-60 min) was investigated. All experiments were conducted in batch mode at room temperature (~21 oC). The obtained equilibrium adsorption isotherms were analyzed using the Langmuir and Freundlich models. Furthermore, the kinetics of dichromate removal was analyzed by pseudo-first order, pseudo-second order and the Elovich models. Optimum conditions for obtaining high removal (~97%) within a relatively short time (60 min) are: 5.0 pH, 0.100 g SDS-chitosan dosage and an initial Cr2O72- concentration of 10 mg L-1. The dichromate adsorption capacity of chitosan is 8.3 mg L-1, while that of SDS-chitosan is 9.7 mg L-1. In addition, the adsorption of dichromate by chitosan and SDS-chitosan is well-fitted by the Langmuir and Freundlich models while the adsorption kinetics is best fitted by the pseudo-second-order kinetic model.
六价铬(Cr(VI))具有形成阴离子物种的特性,这些阴离子物种毒性很大,极易溶于水,难以去除。研究了壳聚糖和十二烷基硫酸钠改性壳聚糖对水溶液中重铬酸盐的去除。研究了各种实验参数,如pH(1-9)、初始浓度(10-100mg L-1)、吸附剂剂量(0.005-0.350g)和接触时间(5-60min)的影响。所有实验均在室温(~21℃)下分批进行。利用Langmuir和Freundlich模型分析了所获得的平衡吸附等温线。此外,采用拟一阶、拟二阶和Elovich模型对重铬酸盐的去除动力学进行了分析。在相对较短的时间(60分钟)内获得高去除率(~97%)的最佳条件是:5.0 pH,0.100 g SDS壳聚糖剂量和10 mg L-1的初始Cr2O72浓度。壳聚糖对重铬酸盐的吸附量为8.3mg L-1,而SDS壳聚糖对重铬酸钾的吸附量则为9.7mg L-1。此外,壳聚糖和SDS壳聚糖对重铬酸盐的吸附用Langmuir和Freundlich模型拟合良好,而吸附动力学用拟二阶动力学模型拟合最好。
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引用次数: 0
Assessment of Heavy Metal Contamination in Roadside Soils along Irbid-Amman Highway, Jordan by ICP-OES ICP-OES法评价约旦伊比德-安曼高速公路路边土壤重金属污染
IF 0.4 Pub Date : 2020-02-16 DOI: 10.47014/15.1.1
“Ayat Allah” T. Al-Massaedh
In this study, the concentrations of selected heavy metals (Al, Cd, Cr, Cu, Mn, Pb, Co, Fe, Ni, V and Zn) in roadside soil samples were determined by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) after microwave digestion. A total of sixty roadside soil samples were collected during July 2018 from seventeen sampling sites (5 km apart) from both sides along Irbid-Amman highway, Jordan. The average concentrations (±SD) of the investigated metals in the analyzed soil samples were found to be 18400 (± 11200), 6.0 (± 4.7), 132 (± 47), 49 (± 26), 695 (± 310), 96 (± 53), 78 (± 32), 31800 (± 12600), 116 (± 67), 141 (± 74) and 129 (± 112) µg/g for Al, Cd, Cr, Cu, Mn, Pb, Co, Fe, Ni, V and Zn, respectively. With exception of Mn, the enrichment factors for the investigated metals in roadside soils were found to be more than 10, indicating anthropogenic sources such as automobile traffic. In the absence of any industrial activities in the sampling sites, the high concentrations of the investigated metals suggest that automobile emissions are the major source of roadside soil pollution. The results obtained in this study showed that metal concentrations in the analyzed soil samples are strongly influenced by the wind direction and traffic density in the investigated area. The higher metal concentrations on the west side of the road were due to the easterly prevailing wind in the studied area. As expected, the concentrations of heavy metals decreased with increasing distance from the edge of the road. The results obtained in this work were compared with the literature values.
在本研究中,采用微波消解后的电感耦合等离子体发射光谱法(ICP-OES)测定了路边土壤样品中选定的重金属(Al、Cd、Cr、Cu、Mn、Pb、Co、Fe、Ni、V和Zn)的浓度。2018年7月,从约旦Irbid Amman公路两侧的17个采样点(相距5公里)共采集了60个路边土壤样本。在分析的土壤样品中,研究金属的平均浓度(±SD)分别为18400(±11200)、6.0(±4.7)、132(±47)、49(±26)、695(±310)、96(±53)、78(±32)、31800(±12600)、116(±67)、141(±74)和129(±112)µg/g(Al、Cd、Cr、Cu、Mn、Pb、Co、Fe、Ni、V和Zn)。除Mn外,路边土壤中所调查金属的富集因子超过10,表明人为来源,如汽车交通。在采样点没有任何工业活动的情况下,所调查金属的高浓度表明,汽车排放是路边土壤污染的主要来源。本研究的结果表明,所分析土壤样品中的金属浓度受到调查区域风向和交通密度的强烈影响。道路西侧的金属浓度较高是由于研究区域盛行东风。正如预期的那样,重金属浓度随着距离道路边缘距离的增加而降低。将这项工作的结果与文献值进行了比较。
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引用次数: 4
Effects of Milling Time and Speed on Nutrient Availability of KH2PO4 with Kaolinite as Physical Type Slow/Controlled Release Fertilizers 碾磨时间和速度对高岭石为物理型缓控释肥料KH2PO4养分有效性的影响
IF 0.4 Pub Date : 2020-01-01 DOI: 10.47014/15.2.1
A. Al-Rawajfeh, Mohammad Alrbaihat, E. AlShamaileh
Mechanochemical processing was applied to produce slow-release fertilizers consisting of kaolinite as clay material and (KDP) KH2PO4 in 3:1 weight ratio by grinding the contents in a planetary ball mill at milling rotational speeds ranging from 200 to 700 rpm for 2 h and at different milling times ranging between 1-3 h at 600 rpm milling speed. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and coupled ion chromatography (IC) were used to characterize the prepared samples. It was shown that the mechanochemical process succeeded to incorporate KDP into the kaolinite structure. The K+ and PO43- ions released from the kaolinite–KH2PO4 system when dispersed in distilled water for 24 h were measured. The results indicate that the prepared kaolinite–KH2PO4 system acts as a carrier of K+ and PO43- nutrients to be used as slow-released fertilizers
以高岭石为粘土矿料,以(KDP) KH2PO4为原料,以3:1的重量比,在行星球磨机中,以200 ~ 700转/分的磨粉转速和600转/分的不同磨粉时间分别磨2 h和1 ~ 3 h,采用机械化学处理法制备出缓释肥料。采用傅里叶变换红外光谱(FTIR)、x射线衍射(XRD)、热重分析(TGA)和耦合离子色谱(IC)对制备的样品进行了表征。结果表明,机械化学过程成功地将KDP融入到高岭石结构中。测定了高岭石- kh2po4体系在蒸馏水中分散24 h后释放的K+和PO43-离子。结果表明,制备的高岭石- kh2po4体系作为钾+和PO43-养分的载体,可作为缓释肥料
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引用次数: 5
Synthesis, Molecular Docking and Evaluation of Hetaryl Fragment Tagged 1H-1,2,4-Triazole Derivatives As Nematicidal Agents Hetaryl片段标记1h -1,2,4-三唑类杀线虫剂的合成、分子对接及评价
IF 0.4 Pub Date : 1900-01-01 DOI: 10.47014/16.1.1
New hetaryl fragment tagged 1H-1,2,4-triazole derivatives 7a-l were designed and synthesized via Suzuki coupling between the bromo derivatives 4-6, which were used as key intermediates for the synthesis of our targets and the appropriate boronic acid. The structures of the newly synthesized compounds were unambiguously confirmed through physico-chemical analysis (1H, 13C NMR and mass spectra). Six synthesized 1,2,4-triazole derivatives were selected to evaluate the potential nematocidal effect and to analyze their structure-activity relationships. Nematocidal activity of the compounds at (50, 100, 200, 300, 400 and 500 µM) was tested against Bursaphelenchus xylophilus nematode wherein the best activity was recorded for compound 7e (52.1% ± 1.8 mortality at 100 µM). The highest mortality rates of 88% and 55% were observed for 7e and 7h, respectively at 500 μM after exposure for 6 h. The molecular docking of compounds 7e, 7h and 7g has been studied and its results revealed that the newly designed hetaryl fragment tagged 1H-1,2,4-triazole derivatives bind to the hydrophobic pocket and polar contact with high affinity.
通过溴衍生物4-6之间的Suzuki偶联,设计并合成了标记1h -1,2,4-三唑衍生物7a-l的新己基片段,并将其作为合成目标物和合适硼酸的关键中间体。通过物理化学分析(1H, 13C NMR和质谱)明确了新合成化合物的结构。选择6个合成的1,2,4-三唑衍生物,评价其潜在的杀线虫作用,并分析其构效关系。测定了化合物在(50、100、200、300、400和500µM)下的杀线虫活性,其中化合物7e在100µM下的杀线虫活性最高(52.1%±1.8)。在500 μM下暴露6h后,7e和7h的死亡率最高,分别为88%和55%。对化合物7e、7h和7g的分子对接进行了研究,结果表明,新设计的带有1h -1,2,4-三唑衍生物的己烯基片段与疏水袋和极性接触具有高亲和力。
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引用次数: 1
Post-functionalization of Ether-linked Polymer via the Application of Ullmann-coupling Reaction: Synthesis, Characterization and Thermal Degradation Kinetics 应用ullmann偶联反应的醚连接聚合物的后功能化:合成、表征和热降解动力学
IF 0.4 Pub Date : 1900-01-01 DOI: 10.47014/16.1.3
A new ether-linked polymer (PE-A) was synthesized via the polycondensation of 1,4-dibromo-2,5-difluorobenzene with biphenol (A). The new polymer has shown a good solubility in non-polar solvents, as well as moderate thermal stability (up to 300 °C). The parent PE-A was subjected to post-functionalization modification applying the Ullmann-coupling reaction on the C-Br bonds of PE-A, where the bromo-sites have been replaced by aniline-linked moieties. The resulting polymer (PE-Ani-A) shows slight solubility in several solvents. Its thermal stability was enhanced by 36% when compared with PE-A. To ensure the significant impact of the inclusion of the aniline group on thermal stability, a thermal degradation kinetics study was performed and the Coats-Redfren and Broido theoretical models were applied to explore the degradation process. The calculated activation energy for PE-Ani-A degradation was thereby found to be higher than that of PE-A, which indicates the higher thermal stability of PE-Ani-A. For further insights into the thermal stability of the polymers, the limited oxygen index (LOI), which represents the flame-retardant property of the polymers, was calculated. The results indicate that PE-A is a promising candidate as a flame-retardant polymer (LOI = 46.7), since it has a high bromo-content. On the other hand, PE-Ani-A has a lower LOI although it has a higher thermal stability.
以1,4-二溴-2,5-二氟苯与双酚(A)缩聚合成了一种新型醚连接聚合物(PE-A)。该聚合物在非极性溶剂中具有良好的溶解度,并且具有中等的热稳定性(高达300℃)。在PE-A的C-Br键上应用ullmann偶联反应对母体PE-A进行了后功能化修饰,其中溴位点被苯胺连接的基团取代。所得聚合物(PE-Ani-A)在几种溶剂中具有轻微的溶解度。与PE-A相比,热稳定性提高了36%。为了确保苯胺基团的加入对热稳定性的显著影响,进行了热降解动力学研究,并应用Coats-Redfren和Broido理论模型来探索降解过程。由此计算出PE-Ani-A的降解活化能要高于PE-A,说明PE-Ani-A具有更高的热稳定性。为了进一步了解聚合物的热稳定性,计算了代表聚合物阻燃性能的限氧指数(LOI)。结果表明,PE-A具有较高的溴含量,是一种很有前途的阻燃聚合物(LOI = 46.7)。另一方面,PE-Ani-A具有较低的LOI,尽管它具有较高的热稳定性。
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引用次数: 2
Green Chemistry: A Simple Manual Apparatus for Potentiometric and Conductometric Micro-Titration of Small Samples for the Educational Laboratory 绿色化学:用于教育实验室小样品电位和电导微滴定的简易手动仪器
IF 0.4 Pub Date : 1900-01-01 DOI: 10.47014/16.1.2
A simple manual micro-titration method is proposed for the potentiometric and conductometric titration of 200 to 800 µL of liquid samples. The sample to be titrated is dispensed into the titration chamber; the bottom section of a plastic test tube that is glued to the center of a small stirring magnet. After inserting the sensing probe and the tip of the titrant delivery tip into the titration chamber, the chamber-stirring magnet assembly is spun at low speed using a conventional magnetic stirrer. Titrant is delivered (with 0.2 µL resolution) from the submerged tip of a 100-µL capacity micro-pipette by rotating the plunger with the locking ring unlocked. The apparatus has been used for potentiometric titration and conductometric titration of acids and bases usually encountered in educational laboratories. Compared with macro-scale titrations, the obtained accuracy was between +2.2% and -3.9% relative error and the precision ranged between 1.6% and 2.9% relative standard deviation. The proposed procedure cuts the reagent consumption to 1% or less compared with conventional macro-scale titrations.
提出了一种简单的手动微滴定法,用于200 ~ 800µL液体样品的电位滴定和电导滴定。将待滴定的样品分配到滴定室中;塑料试管的底部,粘在一个小的搅拌磁铁的中心。将感应探针和滴定剂输送端尖插入滴定室后,使用常规磁力搅拌器低速旋转室搅拌磁铁组件。通过旋转柱塞,锁定环解锁,滴定剂从100µL容量的微移液管的浸没尖端(0.2µL分辨率)交付。该仪器已用于教育实验室中经常遇到的酸和碱的电位滴定和电导滴定。与宏观滴定法相比,准确度相对误差在+2.2% ~ -3.9%之间,精密度相对标准差在1.6% ~ 2.9%之间。与传统的大规模滴定相比,所提出的程序将试剂消耗减少到1%或更少。
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引用次数: 1
期刊
Jordan Journal of Chemistry
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