Page 6 - Shimadzu Nexis SCD-2030

Best-in-Class Sensitivity Optimized Applications

It is well known that the SCD gives the highest sensitivity for sulfur compounds among the existing detection methods. Reliable analysis with best-in-class sensitivity for fields such as petrochemical and food production.
By incorporating an ultrashort flow path and a high efficiency redox cell, the Nexis SCD-2030 further raises the bar for sulfur
chemiluminescence detection.

Ultra Short Flow Path Patent Pending Measurement of Sulfur Compounds in Gasoline ASTM D5623 Compliant

Quantification of sulfur compounds in gasoline is very important. The Nexis SCD-2030 offers linear sensitivity with respect to sulfur
In order to prevent losses in sensitivity, Nexis SCD-2030 introduces unstable
compounds, and since it is unaffected by hydrocarbons coexisting in diesel fuel, it is capable of highly accurate analysis.
components generated in the redox cell into the reaction chamber at the high speeds.
This is accomplished by utilizing the industry’s first ultrashort flow path. As the flow
path becomes shorter, about 2.5 times higher sensitivity for both peak area and signal 15 17 Concentration
Compound ppm (w/w) Linearity
to noise ratio can be obtained when compared to other SCDs currently offered in the 16 18 (R )
2
0.1 1 10 100
market.
1 Methyl mercaptan 7.1 1.8 5.1 3.0 0.9999
9 11 2 Ethyl mercaptan 6.5 1.5 3.7 2.3 0.9999
Long Flow Path 1 12
4 7 10 3 4 Dimethyl sulfide 6.8 1.3 3.7 2.4 0.9999
1.9
4.4
7.3
2.7
Carbon disulfide
0.9999
Detector 2 3 5 6 8 13 14 5 6 2-Propanethiol 6.7 1.4 2.9 2.0 0.9999
9.7
2-Methyl-2-propanethiol
0.9999
1.9
2.8
2.5
7 1-Propanethiol 6.3 1.4 2.9 1.9 0.9999
8 Ethyl methyl sulfide 7.7 1.8 2.8 2.2 0.9999
Ultra Short Flow Path 9 Thiophene 6.7 1.7 2.8 2.0 0.9999
Sulfur Monoxide 19 10 2-Methyl-1-propanethiol 8.5 3.1 1.7 2.3 0.9999
(Very unstable)
Detector The others are 11 Diethyl sulfide 4.8 2.9 1.9 2.3 0.9999
Sulfur Compounds.
12
9.1
3.8
1.8
0.9999
1-Butanethiol
2.4
Ultra Short Flow Path
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 min 13 Methyl disulfide 1.9 2.6 2.1 2.3 1.0000
Chromatogram of a Standard Sample of 18 Sulfur Compounds 14 2-Methylthiophene 9.7 3.2 1.8 2.3 0.9999
(Each compound has a sulfur concentration of 10 ppm (w/w)) 15 3-Methylthiophene 6.0 2.8 1.5 2.4 0.9999
1 Methyl mercaptan 8 Ethyl methyl sulfide 15 3-Methylthiophene 16 Diethyl disulfide 3.7 2.8 1.8 2.4 0.9999
2 Ethyl mercaptan 9 Thiophene 16 Diethyl disulfide 17 5-Methylbenzothiophene 9.4 1.5 1.9 1.8 0.9999
Analysis of Trace Sulfur Compounds in Natural Gas ASTM D5504 Compliant 3 Dimethyl sulfide 10 2-Methyl-1-propanethiol 17 5-Methylbenzothiophene 18 3-Methylbenzothiophene 9.6 4.1 1.7 2.5 0.9999
4 Carbon disulfide
18 3-Methylbenzothiophene
11 Diethyl sulfide
5 2-Propanethiol 12 1-Butanethiol 19 Diphenyl sulfide
6 2-Methyl-2-propanethiol 13 Methyl disulfide (Internal standard) Repeatability (RSD%, n=5) and Linearity of Sulfur Compounds
7 1-Propanethiol 14 2-Methylthiophene
Monitoring sulfur compounds is very important for protecting 1 Hydrogen sulfide
2 2 Carbonyl sulfide
the valuable catalysts used in the reaction process. The Nexis 1 3 Methyl mercaptan
4 Ethyl mercaptan
SCD-2030 is capable of the high-sensitivity detection of various 6 5 Dimethyl sulfide Analysis of Trace Fragrant Components in Foods Using a Headspace Sampler
6 Carbon disulfide
sulfur compounds contained in natural gas and petroleum 3 7 2-Propanethiol
4 14 8 t-Butanethiol
products. 11 12 9 1-Propanethiol In combination with the HS-20 headspace sampler, the Nexis SCD-2030 can quantify fragrant sulfur components in beverages.
10 10 Methy lethyl sulfide Sulfur compounds play an important role as trace fragrant components in foods. While sulfur compounds heighten the flavor and
11 Thiophene
5
12 Diethyl sulfide aroma of foods, excess quantities will lead to bad odors. Additionally, they are used as additives to prevent putrefaction and to
8 13 n-Butanethiol
7 9 13 14 Dimethyl disulfide control oxidation.
4
Beer 1 (Ale) 1 Methanethiol
Beer 2 (Lager) 2 Dimethyl sulfide
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 min Beer 3 (Lager) 3 Carbon Disulfide
Chromatogram of a Standard Sample of 14 Sulfur Compounds 4 Ethyl Methyl Sulfide (Internal standard)
(1 ppm v/v) (50 µL loaded in the column) 2 5 S-Methyl Thioacetate
6 Dimethyl Disulfide
Note: Each concentration of actual standard gas is 0.93–1.09 ppm. 7 Diethyl Disulfide
8 Dimethyl Trisulfide
1 3 5 6 7 8
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 min
Nexis SCD-2030 + Headspace Sampler HS-20 Chromatogram of Volatile Sulfur Compounds in Beer
SCD-2030
6 Sulfur Chemiluminescence Detection Gas Chromatograph System 7