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正戊酸

BW901071

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109-52-4

0.5mL

秦境

99.0%

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正戊酸介绍：

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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国家标准解读：正戊酸（CAS:109-52-4）相关检测标准

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水中正戊酸等挥发性有机酸的检测。

核心检测方法

气相色谱-质谱联用法（GC-MS）。样品经酸化处理后，通过液液萃取或固相萃取富集，经毛细管色谱柱分离后，质谱定性定量分析。

检出限与定量限

检出限为0.005 mg/L，定量限为0.015 mg/L。实验需通过空白加标验证实际检测能力。

质控样品要求

每批次样品需包含空白对照、平行样及加标回收样。加标浓度应为定量限的2~5倍，回收率控制在80%~120%。

关键实验步骤

1. 样品预处理：调节pH≤2，加入内标物；
2. 萃取：使用二氯甲烷进行液液萃取；
3. 浓缩：氮吹浓缩至1 mL；
4. 仪器分析：设定分流比10:1，离子源温度230°C。

特别说明

1. 需避免使用含同类有机酸的试剂；
2. 色谱柱建议选用DB-5MS或等效型号；
3. 实验环境温度需控制在25±2°C。

以上信息仅供参考，请以相应标准的原文为准！