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二甲苯

BW901075

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1330-20-7

0.5mL

秦境

99.5%

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二甲苯介绍：

Reference Material

This certificate is designed in accordance with ISO 17034 and ISO Guide 31. This reference material (RM) was designed,produced and verified in accordance with ISO/IEC 17025, ISO 17034 and a registered quality management system ISO9001.

Uncertainty

The certified value(s) and uncertainty(ies) are determined in accordance with ISO 17034 with an 95% confidence level (k=2). Uncertainty is based on the Total Combined Uncertainty, including uncertainties of characterisation, homogeneity and stability testing. Stability values are based on real evidence opposed to simulation.

The producer certifies that this reference material meets the specification stated in this certificate until the expiry date, provided it is stored unopened at the recommended temperature herein. Product warranties for this reference material are set out in the terms and conditions of purchase.

Intended Use

This RM is intended for use in a laboratory as a calibration and quality control standard or in method development for analytical techniques.

Safety

Proper precautions should be observed while handling. See Safety Data Sheet.

Traceability

The balances used for gravimetric measurements are calibrated with weights traceable to the national standards (DKD). The calibration of the balances is verified daily internally and annually by an external7 accredited calibration service. Chromatographic methods are traceable to the International System of Units (SI).

Homogeneity

Random replicate samples of the final packaged RM have been analysed to prove homogeneity compliant with ISO 17034.

Storage

The RM should be stored in the original sealed container at the indicated temperature.

Instructions for use

It is recommended to use 1 mg as the minimum sample size and if less material is used, to increase the certified uncertainty by a factor of two for half sample and four for a quarter of sample. If storage after opening is necessary, the RM should be tightly closed and kept from light and moisture. If the RM was in a sealed ampoule, it should be transferred to a vial with minimum head space.

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国家标准《室内空气质量标准》解读

标准名称及标准号	GB/T 18883-2002《室内空气质量标准》中苯系物（含二甲苯）检测相关要求
适用范围	适用于室内空气中二甲苯的浓度检测，包括居住及公共场所空气质量评价。
核心检测方法	使用Tenax TA吸附管采集空气样品，热解吸-气相色谱法（GC-FID）定量分析。
检出限与定量限	检出限：0.5 μg/m³；定量下限：1.0 μg/m³（以采样体积10 L计）。
质控样品要求	每批次需包含至少1个空白样品及平行样，加标回收率应控制在80%-120%之间。
关键实验步骤	1. 采样流量控制在0.5 L/min，时间20-30分钟； 2. 热解吸温度280℃，解析时间10分钟； 3. 气相色谱柱为HP-5毛细管柱，柱温箱程序升温。
特别说明	需注意采样环境温度（10-35℃）和湿度（≤80%）的干扰控制，避免吸附管穿透失效。

行业标准《环境空气苯系物的测定》解读

标准名称及标准号	HJ 583-2010《环境空气苯系物的测定固体吸附/热脱附-气相色谱法》
适用范围	用于环境空气及固定污染源无组织排放中二甲苯的测定。
核心检测方法	以活性炭或Tenax GR吸附管富集，热脱附后经气相色谱分离检测。
检出限与定量限	单组分最低检出限0.01 μg，定量范围为0.04-20 μg（以采样体积20 L计）。
质控样品要求	每10个样品需插入1个运输空白，实验室加标回收率要求≥75%。
关键实验步骤	1. 吸附管老化温度需达到350℃，载气纯度≥99.999%； 2. 气相色谱检测器为FID，进样口温度200℃。
特别说明	强调吸附管解吸效率需定期验证（每半年一次），偏差超过±15%需更换吸附剂。

以上信息仅供参考，请以相应标准的原文为准！