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APPLICATION NOTE

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www.paclp.com

MultiTek Total Sulfur Analysis of Aviation Fuel Jet A-1by UV-Fluorescence

Rapid and Accurate Determination

of Chemically Bound Sulfur

Fully Automated Combustion

System

Repeatable and Reliable Sample

Analysis

Keywords:

Mult iTek, Total Su lfur , UVF, Jet A -1,

Ac cur acy, Repeatabil ity , ASTM D5453

Instrumentation:Antek MultiTek VS,

with Liquid Autosampler,

Antek Model 758.

Introduction:By regulation the determination of total sulfur in

aviation fuel is obligatory in order to limit pollution of

the stratosphere caused by SO2.

The application note shows, how theMultiTek

analyzer system fulfills the requirements for analysis

of total sulfur in Jet fuel, based on ASTM D5453.

Different Jet A-1 round robin (RR)1samples were

analyzed and compared to the RR results.

Principle of Operation:The hydrocarbon sample is introduced into a

pyrotube at 1050C. If sulfur compounds are

present, combustion in an oxygen-rich atmosphere

produces SO2 , CO2and H2O (1):

R-S + O2 SO2+ CO2+ H2O (1)

Entering the detector cell, the SO2molecules

illuminated by UV-light (2), followed by

characteristic sulfur fluorescence (3):

SO2+ h SO2* (2)

SO2* SO2 + h (3)

The intensity of the sulfur fluorescence is used for

calibration and quantification.

Instrument Parameters:

Syringe Size (l)

25

Sample Fill Volume (l)2 5 / 10 / 15

GFC1Ar/He (ml/min)

140

GFC2Pyro O2(ml/min) 400

GFC4Carrier O2(ml/min) 30

Furnace (oC)

1050

Cycle Time (mm:ss)

5:00

S-PMT High Voltage (V)2 450 / 550 / 600

1Annual Round Robin by Mineral Oil and Fuels Standardization

Committee within DIN (FAM).

Jet A-1 samples originate from RR 2010 & 2012.2 Parameter adjusted, depending on the sulfur concentration range.

1050C

EXPERIMENTAL CONDITIONS

8/10/2019 Total Sulfur Aviation Fuel

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APPLICATION NOTE

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Calibration:Based on the expected sulfur concentrations, the MultiTek analyzer was calibrated to cover three different

working ranges from 0.51000 mg S/l in total, according to ASTM D5453.

Standard Solutions of Dibenzothiphene in Xylene were used for calibration.

Fig.1: Calibration 0.5 10 mg S/l Fig.2: Calibration 5 100 mg S/l Fig.3: Calibration 100 1000 mg S/l

Sample

ID#Labs

RR

Mean

(mg S/kg)

RR

Mean SD

(mg S/kg)

MultiTek

Mean (N = 10)

(mg S/kg)

MultiTek

Mean SD

(mg S/kg)

Z -

Score

R (D5453)

Jet 755 12 127.1 2.48 128.3 0.15 0.16

Jet 756 12 6.27 0.30 6.30 0.04 0.03

Jet 775 10 108.6 2.14 108.7 0.16 0.01

Jet 776 8 217.3 5.49 214.6 0.31 0.22

Results:

Table 1 shows a comparison between the MultiTek results and the reported RR mean. Referring to thereproducibility (R) and the corresponded standard deviation of the ASTM method, the Z-score is calculated.

The MultiTek is the only instrument on the market that combines sulfur, nitrogen, and halides analysis all in one. Compact,

powerful, automated, and able to analyze gas, liquid, or solid samples, its the perfect solution to todaysincreasing demand

worldwide for fast, accurate detection and analysis of contaminants, and corrosive elements.Because MultiTek delivers precise results with high sensitivity and unmatched versatility,

itsa valuable process optimization tool that will deliver faster ROI and a better bottom line.

Table 1: Comparison of Round Robin and MultiTek results

Repeatability:To demonstrate the excellent precision and

reliability of the MultiTek analyzer, the Jet sample

Jet 756 was used for a long term repeatability

test (Fig. 4).

Fig. 4: Long Term Repeatability Test

Conclusion:These results confirm that the MultiTek fulfills

the requirements of an accurate, precise and

reliable analyzer system.

The MultiTek supports users in their daily

requirement to maintain the quality of analysis.

R = 0.99985 R = 0.99994 R = 0.99998

Mean = 6.31 mg/kg

SD = 0.086 mg/kg

Max = 6.49 mg/kg

Min = 6.11 mg/kg

00.01.301 2013/1 - Copyright 2013 PAC L.P. All rights reserved