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醛和酮检测项目报价? 解决方案? 检测周期? 样品要求? |
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本标准适用于以乙醇或乙烯为原料在硫酸作用下脱水后分馏制得的食品添加剂乙醚。
本标准规定了用卡尔.费休目测法和电量法测定样品游离水或结晶水含量的通用方法。本标准适用于大部分有机和无机固、液体化工产品中游离水或结晶水含量的测定。本标准不适用于能与卡尔.费休试剂的主要成分反应并生产 水的样品以及能还原碘或氧化碘化物的样品中水分的测定。在某些情况下,样品需要预处理措施,它们均在相应的标准中作了规定。当没有电量法的仪器时,可使用目测法,它是一种直接滴定法,但只能用于无色的溶液。电量法包括直接滴定和反滴定两种方法,无论采用哪一种,都是较为准确的,因此,推荐用电量法。
本标准规定了木材工业用胶粘剂及其树脂的检验方法。本标准的3.1、3.2、3.3、3.4、3.5适用于木材工业用胶粘剂用三聚氰胺改性脲醛树脂、酚醛树脂、三聚氰胺甲醛树脂外观、密度、黏度、pH值和固体含量的测定。本标准的3.6适用于木材工业用胶粘剂用水溶性酚醛树脂和三聚氰胺改性脲醛树脂水混合性的测定。本标准的3.7、3.8、3.17、3.18适用于木材工业用胶粘剂用三聚氰胺改性脲醛树脂固化时间、适用期、羟甲基含量和沉析温度的测定。本标准的3.9适用于木材工业用胶粘剂用三聚氰胺改性脲醛树脂和酚醛树脂贮存稳定性的测定。本标准的3.10.1适用于木材工业用胶粘剂用三聚氰胺改性脲醛树脂、酚醛树脂生产的胶合板的胶合强度的测定;本标准的3.10.2适用于木材工业用胶粘剂用脲醛树脂和酚醛树脂生产的中密度纤维板和刨花板的内结合强度测定。本标准的3.11适用于木材工业用胶粘剂用醇溶性酚醛树脂含水率的测定。本标准的3.12适用于木材工业用胶粘剂用可溶性和低熔点可熔性酚醛树脂凝胶时间的测定;不适用于凝胶时间过短的粉状如酚醛树脂、线性酚醛等不能自身固化的树脂以及含有大量低沸点溶剂的树脂凝胶时间的测定。可以测定在有催化剂条件下的凝胶时间。催化剂可按固定的比例加入,使用催化剂固化的凝胶时间应在报告中说明使用固化剂的类型和样品处理方法。本标准的3.13适用于木材工业用胶粘剂用酚醛树脂游离苯酚含量的测定。本标准的3.14适用于木材工业用胶粘剂用水溶性酚醛树脂可被溴化物含量的测定。本标准的3.15适用于木材工业用胶粘剂用水溶性酚醛树脂碱含量的测定。本标准的3.16.1适用于木材工业用胶粘剂用游离甲醛含量不大于15%的酚醛树脂的游离甲醛含量的测定。本标准的3.16.2适用于木材工业用胶粘剂用脲醛、三聚氰胺改性脲醛树脂游离甲醛含量的测定,此方法不适用于酚醛树脂改性的呋喃树脂游离甲醛含量的测定。
本标准规定了酚醛树脂及其改性树脂中游离甲醛含量的测定方法。本标准适用于酚醛树脂及其改性树脂中游离甲醛含量的测定,其结果仅代表测定时树脂中的游离甲醛实际含量,与树脂加工过程中或加工后的游离甲醛含量无直接关系。
GB/T 34903的本部分规定了服役于石油与天然气生产设备中的非金属材料选用与评价的一般原则、基本要求、推荐做法以及产品质量保证指南。非金属材料失效导致的设备损坏会造成公众健康、人员安全与环境风险。本部分有助于避免设备发生这种高昂代价的腐蚀损坏。本部分补充而不是代替设备设计准则、标准或法律规范中已有的材料技术要求。GB/T 34903的本部分规定了石油天然气工业中使用的热塑性塑料材料类型、性能要求、制造要求、相容性评价方法和相容性技术指标判据。本部分适用于但不限于以下设备:非金属管线、管道、衬里、密封件、垫圈和密封圈。本部分不一定适用于炼油化工或石油天然气工业下游加工装置及设备。
GB/T 36700的本部分规定了化学品对水生环境危害分类涉及定量结构活性关系(QSAR)方法使用中导致危险低估的试验因素、模型选择、使用。本部分适用于化学品水生环境危害分类涉及QSAR使用的指导。
本标准规定了采用卡尔费休库仑滴定法测定生橡胶和混炼胶中水分含量的方法。本标准适用于水分含量在0.01%~1%的生橡胶。
本标准规定了用气相色谱法测定费托合成水中C<下标1>~C<下标8>的醇类、醛类和酮类的测定方法和用离子色谱法测定费托合成水中C<下标1>~C<下标6>的正构有机酸的测定方法。本标准适用于费托合成水相产物的组分分析。正构醇类的测定范围为0.003 %~10 %(质量分数);异构醇类的测定范围为0.003 %~1.0 %(质量分数);醛酮类的测定范围为0.003 %~1.0 %(质量分数);有机酸的测定范围为0.01 %~4.0 %(质量分数)。
This Standard specifies a method for determination of aldehydes and ketones content in ethylene glycols at concentrations of 1 mg/Kg to 20 mg/Kg.
This Standard describes the procedure to determine aldhydes and ketones, by the 2,4 dinitrophenylhydrazine (DNPH) method with High Perfomance Liquid Chromatograph, in the light duty vehicles while running on chassis dynamometer, wich simulate the vehicle traveling in an urban transit, as ABNT NBR 6601.
This European Standard is aimed to inform and assist users in the choice and use of the most appropriate method to obtain reliable measurements of the moisture content, or water content, in wood and masonry (including brickwork, stonework, concrete, gypsum, mortars, etc.) in the specific case of the built cultural heritage. It provides a basic framework to take and interpret this kind of measurements on the above cultural heritage materials that have undergone weathering, pest attack, salt migration or other transformations over time. It specifies four absolute methods (i.e. gravimetric, Karl Fischer titration, azeotropic distillation and calcium carbide); explains their characteristics, pros and cons, and gives specifications for the transformation of readings into the same unit to make measurements taken with different methods comparable. It specifies the three principal relative methods (i.e. electrical resistance, capacitance, and relative humidity in equilibrium with the material), pointing out their characteristics and uncertainties when used in the field of cultural heritage. In addition, it provides an informative overview of ten other relative methods, their characteristics, pros and cons. It gives specifications for the calibration of the various methods. It also compares the above methods in relation to their accuracy, sampling requirement, sample size, laboratory or field use, and other problems encountered in the field of cultural heritage to prevent instrument misuse, reduce uncertainties and avoid reading misinterpretation.
This International standard specifies a general laboratory test method for determination of the area specific emission rate of volatile organic compounds (VOCs) and/or the vapour phase VOC concentration under defined climate conditions. This international standard describes emission test chambers used for determination of the emission of volatile organic compounds from resilient, textile and laminate floor coverings. A description of an emission test chamber is given in Annex A. Annexes B and C provide details on the evaluation systems used in Europe and North America, respectively.IMPORTANT ? This test method could be used for the determination of emission of Formaldehyde however more specific methods are in use in the different countries. Please be aware of many countries having legal regulations and requirements for emissions of Formaldehyde based on mandatory test methods other than this method.Studies of the emission of volatile organic compounds from unused (pre-installation) floor covering products in test chambers require proper handling of the product prior to testing, and during the testing period. For each type of floor covering product, specifications are given for the sampling procedures, transport conditions and storage parameters that can affect emissions of volatile organic compounds. For each type of floor covering product, the preparation of a test specimen is prescribed. NOTE Depending on the non-homogeneity of the product, it can be necessary to make measurements on multiple test specimens from the same sample to determine the specific emission rate.
General and substance-specific aspects of the measurement strategy to be taken into account before and during sampling as well as measurement procedures for individual substances or groups of substances in indoor air are described in the single parts of DIN EN ISO 16000. DIN EN ISO 16000-2 deals with the specific aspects of the measurement strategy to be taken into account for the determination of formaldehyde. Especially the requirements for ventilation, humidity, setting of the room temperature, sampling duration as well as screening tests are considered. Before an indoor air measurement can be carried out, its objective has to be defined clearly. The measurement is usually required because of one of the following objectives: a) to check compliance with the guideline value, b) to determine maximum concentrations, c) to check the efficiency of remediation, d) to determine the average concentration over a longer period of time. In the standard the corresponding procedures for sampling and the boundary conditions to be observed are described in detail.#,,#
This part of ISO 16000 is intended as an aid to planning volatile organic compound(VOC)indoor pollutionmeasurements In the case of indoor air measurements,the careful planning of sampling and the entiremeasurement strategy are of particular significance since the result of the measurement may have far-reaching consequences,for example,with regard to the need for remediaI action or the success of such anaction.An inappropriate measurement strategy may contribute to the complete uncertainty of the measurement resultin a larger extent than the measurement procedure itself.This part of ISO 16000 uses the definition for indoor environment defined in ISO 16000—1.
ISO 11402:2004 specifies three methods for determining the free-formaldehyde content in the following:Phenolic resins, by potentiometric titration in aqueous or organic solution (hydroxylamine hydrochloride procedure). The method is applicable to resins with free-formaldehyde contents up to and including 15 % by mass. For free-formaldehyde contents between 15 % by mass and 30 % by mass, it may be necessary to adjust the concentrations of the standard volumetric solutions used accordingly.Amino resins and furan resins (sulfite procedure). The method is applicable to resins resulting from the polycondensation of urea and melamine with formaldehyde and to furan resins resulting from the polycondensation of furfuryl alcohol with formaldehyde without further modification.Condensation resins (KCN procedure), including urea resins, furan resins, melamine resins and phenolic resins, as well as combinations and modifications of these resins.The purpose of this International Standard is to establish recognized and useful determination procedures (for instance in order to check whether official regulations on the handling of hazardous workplace materials are observed).The free-formaldehyde content determined in formaldehyde condensation resins using this International Standard represents the actual content at the time of the determination. The value bears no quantitative relationship to the free-formaldehyde content during or after processing.