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二氯甲烷

BW901098

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75-09-2

100mg

秦境

99.9%

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二氯甲烷介绍：

Method of Characterisation

GC/FID

Batch Information

Water Content: <0.1% (by Karl-Fischer-Titration)

Uncertainty

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

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

Intended Use

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

Safety

Proper precautions should be observed whilehandling. See Safety Data Sheet.

Traceability

The balances used for gravimetric measurements arecalibrated with weights traceable to the national standards (DKD). Thecalibration of the balances is verified daily internally and annually by anexternal7 accredited calibration service. Chromatographic methods are traceableto the International System of Units (SI).

Homogeneity

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

Storage

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

Instructions for use

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

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标准名称及标准号

GB/T 5750.8-2023《生活饮用水标准检验方法有机物指标》

适用范围

适用于生活饮用水及其水源中二氯甲烷的检测，涵盖水样采集、前处理及气相色谱-质谱法（GC-MS）测定。

核心检测方法

采用吹扫捕集/气相色谱-质谱联用法（P&T-GC/MS）。水样经吹扫捕集富集后，通过毛细管色谱柱分离，质谱仪定性定量分析。

检出限与定量限

方法检出限（MDL）为0.5 μg/L，定量限（LOQ）为2.0 μg/L，线性范围1-100 μg/L，相关系数≥0.995。

质控样品要求

每批次需包含空白样、平行样和加标回收样。回收率范围应为80%-120%，相对偏差≤15%。

关键实验步骤

1. 水样密封避光保存，4℃冷藏并在7日内完成检测；
2. 吹扫温度40℃，吹扫时间11分钟；
3. 色谱柱选用DB-624或等效型号；
4. 质谱采用全扫描模式（SCAN）或选择离子监测（SIM）。

特别说明

需避免实验室环境及器皿中的挥发性有机物污染。二氯甲烷易挥发，应在通风橱内操作，使用内衬聚四氟乙烯的密封容器。

以上信息仅供参考，请以相应标准的原文为准！