CCEM500721

Product Name：Tetrahydrofuran

CAS NO.：109-99-9

Molecular Formula：C4H8O

Molecular Weight：72.1 1

Storage：2-8℃ dark and sealed

Appearance：Colorless Liquid

1.Purity

1.1 GC

2.ldentification
2.1 MS

3.Final Result

Water Content:

Method: Karl Fischer

Results

Number of results: n=3 Average: 0.34%

Chromatographic purity（GC）：97.7%

Water Content：0.34%

Assay（100% method）：97.3%

Uncertainty：±2.0%

The calculation of the 100% method follows the formula：

Assay （%） = （100%-Water Content）* Purity GC（%）/100%

Water Content is considered as absolute effect, GC purity is considered as relative effect.

The uncertainty values are the expanded uncerainty and represent an estimated standard deviation equal to the positive square root of the total variation of the uncertainty of components. A normal distribution is assumed and a coverage factor of K=2 is chosen using approximately a 95% confidence level.

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