EDXRF APPLICATION NOTE SULFUR IN BUNKER FUEL # 1230

Transcription

1 EDXRF APPLICATION NOTE ULFUR IN BUNKER FUEL # 1230 COPE The analysis of sulfur in bunker fuel and diesel as per ATM D4294 is demonstrated. BACKGROUND ulfur content is regulated in many petroleum fuels oils, and plays an important role in fuel quality and control of polluting emissions. In the 1970s, the International Maritime Organization (IMO) formed its ship pollution rules at the International Convention on the Prevention of Pollution from hips, known as MARPOL 73/78. ince, the allowed sulfur content of bunker fuels has continued to decline in the open seas and in areas referred to as ulfur Emission Control Areas (ECAs). ECAs are defined protected areas in which only low sulfur bunker fuels and marine diesels can be used. Therefore, it is critical to monitor the sulfur content to ensure regulatory compliance and to improve air quality, affecting those utilizing as well as producing and supplying bunker fuels. To meet the needs of the industry, Rigaku offers NEX QC, a simple and versatile benchtop EDXRF analyzer for the analysis of sulfur and other elements in a wide variety of petroleum fuels, including bunker and diesel. NEX QC is an important tool to meet the requirements for monitoring sulfur at these various levels, with the ability to measure sulfur over a broad range of concentrations and into the future as sulfur levels become even lower. INTRUMENTATION Model: Rigaku NEX QC X-ray tube: 4 W Ag-anode Detector: emiconductor Type: Bunker Fuel & Diesel Film: Mylar Analysis Time: 100 sec Environment: Air Optional: Autosampler AMPLE PREPARATION To measure a sample, gently shake the sample bottle, allow bubbles to settle and fill a 32mm XRF sample cup 3/4 full (5g).

2 ulfur in Bunker Fuel Low Range 0.10 % An empirical calibration was built using a set of commercially available certified bunker oil standards, which is similar to crude or residual oil. Goodness-of-fit is optimized by developing separate calibration methods for different sulfur ranges, if needed. A summary of the calibration for 0.10 is shown here, using a measurement time of 100 sec. td Error of Est: 28 Correlation: TD TD TD TD TD ID td Dev TD TD Page 2

3 ulfur in Bunker Fuel High Range % An empirical calibration was built using a set of commercially available certified bunker oil standards, which is similar to crude or residual oil. Accuracy is optimized by developing separate calibration methods for different sulfur ranges, if needed. A summary of the calibration for is shown here, using a measurement time of 100 sec. td Error of Est: Correlation: TD TD TD TD TD TD ID td Dev TD TD Page 3

4 ulfur in Diesel % An empirical calibration was built using a set of commercially available #2 diesel fuel standards. A summary of the typical high range calibration is shown here, using a measurement time of 100 sec. td Error of Est: 54 Correlation: TD TD TD TD TD TD ID td Dev TD TD TD Page 4

5 TYPICAL DETECTION LIMIT To determine the Lower Limit of Detection (LLD) using the empirical method, ten repeat analyses of mineral oil containing no were measured and the standard deviation calculated. The LLD is then defined as three times the standard deviation. The LLD shown here is application to bunker fuel, diesel and crude oil, over the concentration ranges shown above. 100 sec 20 ppm INTERNATIONAL TANDARD TET METHOD The Rigaku NEX QC complies with the following international standards test methods for measuring sulfur in crude, bunker fuel, diesel and other petroleum oils. Note that by weight 1 ppm = 1 mg/kg. ATM D4294 IO IO 8754 IP 496 IP336 JI K ppm 5% mg/kg 100 mg/kg 5% 100 mg/kg 5% 100 mg/kg 5% % CONCLUION The performance shown here demonstrates the ability of the NEX QC to yield excellent results for the measurement of sulfur in bunker fuel and diesel in air, without the need for helium purge. imple, modern touch screen interface allows for reliable and efficient measurement protocols, and performance meets the major international norms shown above. Page 5