主题：LDPE不透明材料可以用傅立叶红外光谱分析吗

斑竹：
我需要比较两种材料，一种不含BHT，一种可能含有BHT，
这两种材料基质相同。
希望能够有一种有效的样品处理方法，用现有的仪器（FTIR）分析出来

BHT
BUTYLATED HYDROXYTOLUENE

2,6-Di-tert-Butyl-1-Hydroxy-4-Methylbenzene; 3,5-Di-tert-Butyl-4-Hydroxytoluene; 4-Hydroxy-3,5-Di-tert-Butyltoluene; Dibutylated Hydroxytoluene; 4-Methyl-2,6-di-t-butyl-phenol; 2,6-Bis(1,1-dimethylethyl)-4-methylphenol; 2,6-Di-tert-butyl-p-kresol (Dutch); 2,6-di-tert-butyl-p-crésol (French); 2,6-di-terc-butil-p-cresol

请楼主参考:
Evaluation of release of antioxidant from high density polyethylene by planar chromatography.
Food Addit Contam. 1998 May-Jun;15(4):466-72.
Irganox 1330 (1,3,5-trimethyl-2,4,5-tris(3',5'-ditert-butyl)-4'-hydroxybenzyl)- benzene) (I), an alkylphenol compound used as antioxdiant in the production of high density polyethylene (HDPE), was the subject of this study. The quantity of I given up by polyethylene samples of different thickness to aqueous and lipophilic media simulating food was studied by planar chromatography (PC). The manner of antioxidant release was also investigated. The chromatographic method developed was found satisfactory for the quantification of I in the migration studies undertaken, and had quantification limits (12 ng/deposit) suitable for quality control of HDPE.

Product:
Butylated Hydroxy Toluene.

CAS #:
128-37-0.

Synonyms:
2,6-Di-tert-Butyl-1-Hydroxy-4-Methylbenzene; 2,6-Di-tert-Butyl-4-Methylphenol; 3,5-Di-tert-Butyl-4-Hydroxytoluene; 4-Hydroxy-3,5-Di-tert-Butyltoluene; BHT; Butylhydroxytoluene; Dibutylated Hydroxytoluene; Butylated hydroxytoluene; 4-Methyl-2,6-Di-T-Butyl-Phenol; Annulex BHT; Antracine 8; Catalin CAO-3; Dalpac; DBPC; Embanox BHT; Hydagen DEO; Impruvol; Ionol CP; Sustane; Tenox BHT; Topanol OC and 0; Vianol; 2,6-Bis (1,1-Dimethylethyl)-4-Methylphenol; Topanol;

Molecular Formula:
C15H24O.

Molecular Weight:
220.354.




Appearance:
White Crystals.

Purity:
99.0% min (%/wt).

Melting Point:
69.0°C min.

Boiling Point:
265.0°C @760.0 mm Hg.

Flash Point:
135.0°C (Open cup).

Moisture:
0.12% max (%/wt).

Ash Content:
0.01% max (%/wt).

Specific Gravity:
» 1.048 (Solid) @ 4.0°C.

Liquid Density:
1.04 gm/ml.

Viscosity:
2.97 CPS @ 80.0°C.




Solubility at 25.0°C gm/100gm in:
 




Methanol:
20.0.

Benzene:
40.0.

Acetone:
Soluble.

Water:
Insoluble.




Quantity Available:
5.0 MT. every month.

Packing:
25.0 kilos net, new, polylined HDPE bags.

Delivery:
4 to 6 weeks from receipt of confirmation.

Price:
Available on request.

Payment:
Negotiable.




Known Uses: Antioxidant for Petroleum Industry.

Stabiliser for plastics, polymers.

[PDF] Gluqlity Assessments of Recycled Plostics by Spectroscopy qnd ...文件格式: PDF/Adobe Acrobat - HTML 版
... Butylated Hydroxytoluene. Octacosane. Pentacosane. Hexatriacontane. 5-Heptadecene. l-bromo-Oleyl Alcohol. 7-Mehoxy-2,2,4,8-tetramethyltricyclo[5. ... recycled HDPE are fragrance and flavour. products. such as esters and alcohols, ...


http://rss-fukia.org/pdf/Quality_Assessments_of_Recycled_Plastics.pdf

原文由 luolingli 发表:
需要分析主要成分是LDPE的材料内的少量BHT成分，可否用傅立叶红外光谱进行
分析。该材料是不透明，也不易研磨压片。
仪器：岛津 FTIR－8010R（机器挺老的）

提一个参考方法(如果我来进行你的课题,我会首先这样做的,因为BHT在LDPE中通常只有几个ppm):
BHT溶于丙酮,BHT在280nm左右有UV吸收,将样品粉碎,用丙酮处理,测定UV,丙酮在UV中230nm有n-pai吸收带,可以在参比池中用丙酮抵消.
UV定量测定的方法你可以在经典的书中找到.
由于BHT含量很低,IR不一定好.当然GC-MS应该可以,但我认为UV方法会更好一些.

谢谢！
我这两天会试一下。

一般不推荐用红外

谢谢celan老师的答复。
对楼主说声迟到的抱歉，这个帖子我很久没有关注了。
不过，我也觉得whale没有什么地方说错啊！
今天就加精。

可以用红外显微镜的反射模式作。