共查询到20条相似文献，搜索用时 46 毫秒
1.
文章将传统实验与传感器技术相结合,利用氯离子传感器直接测量了原电池电解质溶液中Cl-的浓度,通过两电极Cl-浓度的变化,成功演示出了铜锌原电池中氯离子移动的实验现象。 相似文献
2.
氯离子存在使一些有金属参与的化学反应速率加快的现象为"氯离子效应".针对金属与盐的反应,以铝与硫酸铜溶液反应为研究对象,定量探究氯离子浓度对氯离子效应的影响.研究发现,加入氯离子可以明显加快其反应速率;氯离子浓度在0.5mol/L～2.0mol/L时,增大氯离子浓度会导致化学反应速率加快,氯离子效应增强;氯离子效应对氯离子浓度的要求有一定的峰值,在铝与硫酸铜溶液反应的体系中,当氯化钠的浓度大于2.0 mol/L时,氯离子效应将会略有下降.最后,提出了后续的研究建议和该实验的教学应用建议. 相似文献
3.
本文提出了利用复合银电极自动电位滴定仪测定水泥中微量氯离子含量的方法。试验采用了简单的前处理步骤,确定了样品溶解（酸）及酸度的选择、共存离子的干扰去除等主要因素,建立了一种准确、快速测定水泥中微量氯离子含量的分析方法。在最佳试验条件下,对8种标准水泥样品进行了测定,所得回收率均在98.6%～99.8%之间,说明此法样品前处理简单高效,测试结果准确可靠,能适用于水泥中微量氯离子的测定,是对国标方法的补充。 相似文献
4.
采用紫外—可见分光光度法和莫尔法对不同水样中氯离子含量进行测定。紫外—可见分光光度法通过加入丙酮做保护剂,在最大吸收波长附近测得不同水样中氯离子的吸光度,测得自来水、湖泊水和饮用水中氯离子的含量分别为19.97mg·L-1,8.02mg·L-1,2.00mg·L-1,相对平均误差均小于1,加标回收率在98.9%-100.8%,说明实验结果比较可靠;莫尔法通过控制溶液的酸度以及指示剂的用量测定氯离子含量,测得自来水、湖泊水和饮用水中氯离子的含量分别为20.41mg·L-1,8.31mg·L-1,2.70mg·L-1,相对平均误差较大,加标回收率在91.4%-101.2%,说明实验结果较可靠,同时也说明采用该实验方法测水中氯离子的准确度较高。从实验数据的准确性和实验的简易程度,紫外—可见分光光度法都优于莫尔法。 相似文献
5.
混凝土中氯离子含量的测定 总被引：4，自引：0，他引：4
成立 《荆门职业技术学院学报》2006,21(6):5-7
用电位滴定法测定混凝土中氯离子含量,研究了其影响因素,并将电位滴定法与铬酸钾法进行了比较.结果表明:溶出液振荡时间越长及水固比越大,越有利于氯离子的溶出;淀粉可有效分散氯化银胶体溶液,增强溶液的稳定性;pH值、电极等均对测定有影响;电位滴定法不受色度、浊度影响,其准确度、精密度均高于铬酸钾法. 相似文献
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7.
《西安文理学院学报》2016,(3)
有效去除氯离子是青铜器粉状锈去除的关键.工作中采用电导检测离子色谱法测定了青铜器粉状锈处理液中氯离子,10 min内完成分析检测.在离子色谱实验条件下,峰面积与氯离子浓度在0.1~20 mg/L范围内呈线性,检出限为0.03 mg/L,相对标准偏差在4.41%以下,回收率在98%~104%之间.该方法简单、快速,可以实时监测除锈溶液中氯离子的含量,能很好地反映器物的除锈程度. 相似文献
8.
水泥中氯离子测定方法研究 总被引：1，自引：0，他引：1
张渝 《楚雄师范学院学报》2008,23(9)
经过试验研究水泥生、熟料及其原料中氯离子的测定方法之一——蒸馏分离——汞盐滴定法的准确性、可靠性及易操作性等;并分析比较其它测定方法,查阅了国内外有关氯化物测定的资料,根据目前国内外同行业对氯化物测定方法的特点和数据对比情况,进一步确定检测机构对水泥及其原料中氯离子的测定方法,为下一步《通用硅酸盐水泥》(GB175-2007)标准实施后对水泥质量的监测打下基础。 相似文献
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酸性硫酸铜镀液中氯离子的测定 总被引：1，自引：0，他引：1
酸性光亮镀铜工艺发展已久．由于镀液中氯离子含量对镀层光亮度和阳极行为有较大的影响．一般要求其浓度在20～80mg／L.对镀层中如此低含量氯离子的测定方法有：比色测定法、选择电极法、硫氰化钾回滴法等，但这些方法均有一定的缺点．作者根据实际，得出用AgNO3溶液和Hg(NO3)2溶液分析镀铜液中Clˉ离子的方案和适当的温度条件．该法较其他方法有明显的优点． 相似文献
11.
SUNGWen-pei CHENKuen-suan LINHsue-chun 《浙江大学学报(A卷英文版)》2005,6(3):159-165
INTRODUCTION For some unknown reasons, perhaps caused bysalt, chlorine ions usually exist in reinforced concreteconsisting of cement, water, aggregate and additionalmaterials, and steel bars. In the presence of water, thechlorine ion reacts with iron existing in concrete andsteel bars to form Fe(OH)2 and FeCl2. The chemicalreactions seriously corrodes the surface of steel barsand damage the concrete, causing gradual decrease ofthe concrete compression and increase of its porosity,… 相似文献
12.
One and two dimensional chloride ion diffusion of fly ash concrete under flexural stress 总被引：1，自引：0，他引：1
A preloading frame is firstly designed to accurately apply external flexural stress to concrete specimens. Then a method is
developed to measure one and two dimensional (1D and 2D) chloride ion concentrations at different distances from the surface
of concrete under flexural stress. Using this method and the preloading frame, 1D and 2D stress-diffusion is systematically
investigated for fly ash concretes made with different fly ash contents (0%, 10%, 20%, 40%, and 60%), and water to binder
ratios (0.3, 0.35, and 0.4). The stress accelerating effect on 1D and 2D chloride ion diffusion is also quantitatively analyzed
through a comparison between stress-diffusion and nonstress-diffusion. A diffusion accelerating effect caused by external
flexural stress can clearly be observed through the comparison. In order to quantify the stress accelerating effect, a stress
accelerating factor is proposed in this paper. The relationship between stress accelerating factor and external stress-to-ultimate
stress ratio is given as an exponential function. Finally, the process of the initiation, prorogation, and distribution of
microcracks on the tensile face of specimen is observed in-situ by using a small-sized loading frame and scanning electron
microscope (SEM). The above research provides an insight into chloride attack on the edge reinforcing bars of concrete structures
under flexural stress, such as large-span beam and board in the field of civil engineering. 相似文献
13.
Simple, reliable and sensitive analytical methods to determine anticariogenic agents, preservatives, and artificial sweeteners contained in commercial gargles are necessary for evaluating their effectiveness, safety, and quality. An ion chromatography (IC) method has been described to analyze simultaneously eight anions including fluoride, chloride, sulfate, phosphate,monofluorophosphate, glycerophosphate (anticariogenic agents), sorbate (a preservative), and saccharin (an artificial sweetener)in gargles. In this IC system, we applied a mobile phased gradient elution with KOH, separation by IonPac AS18 columns, and suppressed conductivity detection. Optimized analytical conditions were further evaluated for accuracy. The relative standard deviations (RSDs) of the inter-day's retention time and peak area of all species were less than 0.938% and 8.731%, respectively,while RSDs of 5-day retention time and peak area were less than 1.265% and 8.934%, respectively. The correlation coefficients for targeted analytes ranged from 0.999 7 to 1.000 0. The spiked recoveries for the anions were 90%～102.5%. We concluded that the method can be applied for comprehensive evaluation of commercial gargles. 相似文献
14.
Simple, reliable and sensitive analytical methods to determine anticariogenic agents, preservatives, and artificial sweeteners contained in commercial gargles are necessary for evaluating their effectiveness, safety, and quality. An ion chromatography （IC） method has been described to analyze simultaneously eight anions including fluoride, chloride, sulfate, phosphate, monofluorophosphate, glycerophosphate （anticariogenic agents）, sorbate （a preservative）, and saccharin （an artificial sweetener） in gargles. In this IC system, we applied a mobile phased gradient elution with KOH, separation by IonPac AS18 columns, and suppressed conductivity detection. Optimized analytical conditions were further evaluated for accuracy. The relative standard deviations （RSDs） of the inter-day＇s retention time and peak area of all species were less than 0.938% and 8.731%, respectively, while RSDs of 5-day retention time and peak area were less than 1.265% and 8.934%, respectively. The correlation coefficients for targeted analytes ranged from 0.999 7 to 1.000 0. The spiked recoveries for the anions were 90%-102.5%. We concluded that the method can be applied for comprehensive evaluation of commercial gargles. 相似文献
15.
During the last two decades there has been tremendous progress in the technique of trapping and cooling ions using quadrupole
ion traps. Using these trapping techniques one can have charged particles of a single species confined near the trap centre,
which enables to carry out studies of these ions in a well-controlled environment. The long storage times of the ions, possible
in these traps, results in the elimination of transit-time broadening making it possible to do precision spectroscopic measurements
on these ions. Several important experiments with single electron or ion have been undertaken to address problems related
to basic physics, such as the measurement of the electron radius, precision measurements of fundamental parameters and tests
of the predictions of quantum mechanics. 相似文献
16.
溶胶凝胶基质离子选择电极的研究 总被引：1，自引：1，他引：1
报道了研制的三种溶胶凝胶基质离子选择电极，该电极性能稳定，坚固耐磨，具有适合在严酷条件下使用的特点，同时对进一步研制溶胶凝胶ISFET化学传感器具有探索意义。 相似文献
17.
针对军队院校教学对象英语基础参差不齐、众口难调的现象,昆明消防指挥学校采取一系列改革措施,并取得一些成效,逐步实现从应试教育向应用教育的转变。 相似文献
18.
分析了氯化氨基汞的结构、性质、制备,并进而设计和比较了几种简易且可行性较好的氯化氨基汞检测方法,通过实验检测几种市售祛斑霜所含汞是否超标,提出了祛斑霜中氯化氨基汞是否超标的简易有效的检测方法. 相似文献
19.
以氯气为氯化剂,光催化对间二甲苯进行取代反应,进而水解完成间二苯甲酰氯的合成,对各项反应条件的优化组合,给出制备间二苯甲酰氯的优化工艺条件. 相似文献
20.
将焙烧过的铝土矿粉用一定浓度的盐酸溶解,经过滤,除去不溶物,然后将滤液分成两份,一份中加入Ca(OH)2调整溶液的pH值为6～6.5,得到Al(OH)3和Fe(OH)3沉淀.将此沉淀于另一份滤液中溶解,溶解完全后,所得清液在一定温度的恒温水浴中聚合一段时间,即可得到符合指标的聚合碱式氯化铝铁产品,并利用正交实验及单因素实验对工艺条件进行了优化,得到了最佳工艺条件. 相似文献