微波消解-ICP-OES法测定莴笋中17种矿质元素

利用HNO3/H2O2湿法微波消解制样、再应用全谱直读电感耦合等离子体原子发射光谱法(ICP-OES),对咸阳地产莴笋中的矿质元素组成进行全面的测定与分析。定量分析了K、S、Ca、P、Na、Mg、Al、Zn、Fe、Ba、Si、Cu、Mn、Sr、B、V、Cr等17种矿物元素,定量结果相对标准偏差在0.12%~8.98%之间,标准样品回收率测定在89.0%~109.6%之间。实验结果可为莴笋的应用研究提供基础数据。     

叶面喷施微量元素液体肥对福建紫红荠菜与大叶茼蒿微量元素含量的影响

对福建紫红荠菜与大叶茼蒿叶面喷施微量元素液体肥料进行研究。应用ICP-OES法测定两种蔬菜的微量元素含量。结果显示:用含6种微量元素的液体肥进行叶面喷施,能明显提高福建紫红荠菜的Fe、Zn含量与大叶茼蒿的B含量,两种蔬菜对微量元素吸收的敏感程度表现出差异。据此可通过有选择地施用微量元素肥料的方法来强化作物的营养成分。     

ICP-OES法测定MoO_3/SiO_2催化剂中的Mo含量

采用电感耦合等离子体发射光谱议(ICP-OES)测定了苯酚和草酸二甲酯酯交换合成碳酸二苯酯反应中MoO3/SiO2催化剂的Mo含量。实验表明该方法准确、简便、快捷。在优化的实验条件下,检出限为7.5×10-4 mg/L,相对标准偏差为0.205%,回收率在98%～104%。     

Atomic emission spectroelectrochemistry applied to dealloying phenomena: I. The formation and dissolution of residual copper films on stainless steel

The rates of elemental dissolution were measured for a 304 stainless steel containing 0.19% Cu in real time during linear sweep voltammetry experiments using the atomic emission spectroelectrochemistry (AESEC) method. The results demonstrate that Fe, Cr, Ni, Mn, and Mo dissolve simultaneously leaving a residual copper film that inhibits the steel dissolution. The formation and dissolution of the copper film leads to the appearance of two peaks in the anodic dissolution transient, one due to inhibition of steel by residual copper and the other due to the formation of the passive film. The addition of NaCl to the electrolyte results in a marked increase in the intensity of the second dissolution peak, while hardly affecting the first peak. This is interpreted in terms of the lowering of copper dissolution potential by chloride ions due to the stabilization of CuCl₂⁻. A simple phenomenological kinetic model is used to simulate the variation of dissolution rate with potential.     

电感耦合等离子体发射光谱测定煤中钍、钒、镓、锗

采用HNO3和HF/HCl O4的消解处理样品,采用电感耦合等离子体发射光谱法(ICP-OES)测定灰化煤样中钍、钒、镓、锗4种金属元素含量。实验结果表明,该方法对这4种待测元素的加标回收率范围在93.46%~106.10%之间,相对标准偏差范围在0.91%~4.78%之间,方法的准确度和精密度均符合要求。本方法操作简单、灵敏度高,检测速度快结果准确,能满足煤中多种金属元素同时测定的分析需求。     

渗透型液体硬化剂的鉴别方法研究

国内液体硬化剂的普及程度越来越高,但市场上缺少对液体硬化剂进行有效鉴别的方法.本文介绍了各类液体硬化剂与混凝土的反应机理及利弊,提出了一种新的液体硬化剂的鉴别方法,即:采用pH测试法区分氟硅酸镁与锂基、钠基、钾基液体硬化剂;采用电感耦合等离子体发射光谱仪法检测锂基、钠基、钾基液体硬化剂中各类元素含量.结果表明:pH法与...     

PET膜中26种化学元素向酸性食品模拟物的迁移

目的 研究4种印刷不同油墨的PET薄膜在酸性条件下26种化学元素的迁移行为。方法 采用电感耦合等离子体发射光谱（ICP-OES）,测定铅、镉、铬等26种化学元素在PET薄膜中的初始含量;采用电感耦合等离子体质谱（ICP-MS）测定这26种化学元素向食品模拟物（体积分数为3%的乙酸）的迁移量。结果 铅、镉、铬等26种元素的迁移量随着温度和时间的增加而增大,并且均能达到各自的迁移平衡。ICP-OES方法的加标回收率为80.2%~109.7%,其相对标准偏差（RSD）为0.3%~12.9%;ICP-MS方法的加标回收率为83.1%~118.6%,其相对标准偏差为0.7%~14.8%。结论 26种化学元素向体积分数为3%乙酸的最大迁移量均低于标准限量值。     

采用ICP-OES测定二次盐水中的碘

阐述了用全谱ICP—OES测定二次精制盐水中碘含量的实验条件及准确性,比较了在用ICP—OES测量碘时采用生成挥发物进样技术和普通液体进样技术的2种方法,探讨了采用普通液体进样技术的仪器配置要求、气流参数和高频发生器功率的选择、碘测定谱线的选择等。最后用优化好的条件进行二次盐水中碘含量的测定,并通过实验验证了方法的可行性和稳定性。该法解决了传统方法检验时间长、准确性差的问题。     

A further method for chloride analysis of cement and cementitious materials — ICP-OES

This paper describes the novel application of inductively coupled plasma-optical emission spectroscopy (ICP-OES) for the analysis of the chloride content in various South African cements and cementitious materials. Samples were introduced into the plasma as slurries, with and without 5% (v/v) nitric acid. They were agitated in an ultrasonic bath for 10 min to fully disperse and stabilize the slurries. Calibration was performed by using aqueous solutions of reference materials. Measurements were made on a simultaneous SpectroCIROS^CCD ICP-OES with side on plasma. The accuracy of the chloride determination was verified by the analysis of certified reference material. The findings of this investigation are compared with results obtained for the chloride content by the standard EN196-2 indirect Volhard titration and potentiometry with an ion-selective electrode (ISE), previously described as the preferred method. The results obtained with potentiometry and ICP-OES of various commercially available cements were comparable.