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乳酸乙酯_97-64-3,乳酸乙酯
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乳酸乙酯

BW901011 {{goodObj.price > 0 ? '¥' + goodObj.price : '咨询'}} ¥{{goodObj.sell_price || 0}} 咨询 97-64-3 0.5mL {{goodObj.date}} 秦境 {{item.norm}} 99.9% {{inventory}}
乳酸乙酯介绍:

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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国家标准解读
标准名称及标准号 GB 5009.262-2016《食品安全国家标准 食品中溶剂残留的测定》
适用范围 适用于食品中乳酸乙酯等溶剂残留量的检测,包含液态、固态食品基质。
核心检测方法 顶空-气相色谱法(HS-GC),采用DB-624色谱柱和FID检测器,外标法定量。
检出限与定量限 检出限为0.1 mg/kg,定量限为0.3 mg/kg。
质控样品要求 每批次样品需同时测定空白、平行样及加标回收样,回收率范围要求85%-105%,平行样相对偏差≤10%。
关键实验步骤 称取5.0 g样品于顶空瓶,加入内标溶液并密封,80°C平衡30分钟,进样体积1.0 μL,分流比10:1。
特别说明 若色谱峰存在基质干扰,需使用气相色谱-质谱(GC-MS)进行结果确证。
行业标准GB/T 27576-2011解读
标准名称及标准号 GB/T 27576-2011《化妆品中限用物质检测方法》
适用范围 适用于化妆品中乳酸乙酯等限用物质的定性与定量分析。
核心检测方法 液液萃取结合气相色谱-质谱法(GC-MS),采用DB-5MS色谱柱,内标法定量。
检出限与定量限 检出限为0.5 mg/kg,定量限为1.5 mg/kg。
质控样品要求 每批样品需添加内标物,回收率应≥80%,保留时间偏差≤±0.1分钟。
关键实验步骤 取1.0 g样品,加入10 mL正己烷-丙酮混合溶剂(1:1)超声提取15分钟,离心后氮吹浓缩至0.5 mL,进样分析。
特别说明 若样品含高浓度油脂成分,需经硅胶柱净化后检测。
国家标准GB/T 23971-2009解读
标准名称及标准号 GB/T 23971-2009《工业用乳酸乙酯的测定 气相色谱法》
适用范围 适用于工业级乳酸乙酯的纯度及杂质含量检测。
核心检测方法 直接进样气相色谱法(GC),氢火焰离子化检测器(FID),面积归一化法定量。
检出限与定量限 纯度检测限为0.05%(w/w),杂质定量限为0.01%。
质控样品要求 需使用有证标准物质进行系统适用性验证,重复性相对标准偏差(RSD)≤0.5%。
关键实验步骤 样品经0.45 μm滤膜过滤后直接进样,色谱柱初始温度50°C,以10°C/min升至200°C。
特别说明 若色谱峰出现拖尾,需检查进样口衬管是否污染或色谱柱活性是否降低。

以上信息仅供参考,请以相应标准的原文为准!