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丙酸

BW901101

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79-09-4

秦境

≥98%

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丙酸介绍：

REFERENCE MATERIAL CERTIFICATE

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.

Product Name	Propionic acid
Product Code	BW901101
Lot Number	25101514
CAS No.	79-09-4
Mol. Formula	C₃H₆O₂
Mol. Weight	74.08
Certified on	27 Oct.2025
Expiry Date	26 Oct. 2030
Storage Temp	20°C ± 3°C
Specification	1g

CERTIFIED

Purity

CERTIFIED

Expanded Uncertainty (U)

Approved by

99.5%

1.0%

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 external 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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本公司销售的所有产品仅供实验科研使用，不用于人体及临床诊断。

标准名称及标准号

GB 5009.278-2016《食品安全国家标准食品中丙酸及其盐类的测定》

适用范围

本标准适用于食品（如糕点、面包、调味品等）中丙酸及其盐类（以丙酸计）的含量测定。

核心检测方法

采用气相色谱法（GC）：样品经酸化处理后，丙酸盐转化为游离丙酸，通过水蒸气蒸馏或超声提取，经衍生化或直接进样分析，外标法定量。

检出限与定量限

检出限（LOD）为5 mg/kg，定量限（LOQ）为15 mg/kg。实际限值需根据仪器性能及样品基质调整。

质控样品要求

1. 空白样品：不含目标物的同类型基质，用于评估背景干扰；
2. 加标回收样品：添加已知浓度丙酸标准溶液，回收率应为80%-120%；
3. 平行样测试：每组样品至少设置2个平行样，相对偏差≤10%。

关键实验步骤

1. 样品处理：加入盐酸酸化，使丙酸盐转化为游离丙酸，蒸馏或超声提取；
2. 衍生化（可选）：部分方法需将丙酸与衍生试剂（如BSTFA）反应，提高检测灵敏度；
3. 色谱条件：填充柱或毛细管柱（如HP-FFAP），检测器为氢火焰离子化检测器（FID），程序升温；
4. 定量分析：根据标准曲线计算含量，注意基质效应校正。

特别说明

1. 样品若含挥发性酸（如乙酸），需优化分离条件或选择特异性色谱柱以减少干扰；
2. 若采用直接进样法，需确保样品溶液洁净，避免污染色谱系统；
3. 实验过程中应佩戴防护用具，避免丙酸对皮肤及呼吸道的刺激。

以上信息仅供参考，请以相应标准的原文为准！