What are the sampling and testing methods for sulfur?
The sulfur content of diesel fuel and diesel fuel additives is to be determined in accordance with this section. (a) Sampling method. The applicable sampling methodology is provided in §80.330(b). (b) Test method for sulfur—(1) For ECA marine fuel subject to the 1,000 ppm sulfur standard of §80.510(k), sulfur content may be determined using ASTM D2622 (incorporated by reference, see paragraph (e) of this section). (2) For motor vehicle diesel fuel and diesel fuel additives subject to the 500 ppm sulfur standard of §80.520(c), and NRLM diesel fuel subject to the 500 ppm sulfur standard of §80.510(a)(1), sulfur content may be determined
using ASTM D2622 (incorporated by reference, see paragraph (e) of this section). (3) Beginning August 30, 2004, for motor vehicle diesel fuel and diesel fuel additives subject to the 15 ppm sulfur standard of §80.520(a)(1), sulfur content may be determined using any test method approved under §80.585. (4) Beginning August 30, 2004, for NRLM diesel fuel and diesel fuel additives subject to the 15 ppm standard of §80.510(b), sulfur content may be determined using any test method approved under §80.585. (c) Alternative test methods for sulfur— (1) Options for testing sulfur content of 1,000 ppm diesel fuel. (i) For ECA marine fuel subject to the 1,000 ppm sulfur standard of §80.510(k), sulfur content may be determined using ASTM D4294, ASTM D5453, or ASTM D6920 (all incorporated by reference, see paragraph (e) of this section), provided that the refiner or importer test result is correlated with the appropriate method specified in paragraph (b)(1) of this section; or (ii) For ECA marine fuel subject to the 1,000 ppm sulfur standard of §80.510(k), sulfur content may be determined using any test method approved under §80.585. (2) Options for testing sulfur content of 500 ppm diesel fuel. (i) For motor vehicle diesel fuel and diesel fuel additives subject to the 500 ppm sulfur standard of §80.520(c), and for NRLM diesel fuel subject to the 500 ppm sulfur standard of §80.510(a), sulfur content may be determined using ASTM D4294, ASTM D5453, or ASTM D6920 (all incorporated by reference, see paragraph (e) of this section), provided that the refiner or importer test result is correlated with the appropriate method specified in paragraph (b)(2) of this section; or (ii) For motor vehicle diesel fuel and diesel fuel additives subject to the 500 ppm sulfur standard of §80.520(c), and for NRLM diesel fuel subject to the 500 ppm sulfur standard of §80.510(a), sulfur content may be determined using any test method approved under §80.585. (d) Adjustment factor for downstream test results. (1) Except as specified in paragraph (d)(1)(i) of this section, an adjustment factor of negative two ppm sulfur shall be applied to the test results from any testing of motor vehicle diesel fuel or NRLM diesel fuel downstream of the refinery or import facility, to account for test variability, but only for testing of motor vehicle diesel fuel or NRLM diesel fuel identified as subject to the 15 ppm sulfur standard of §80.510(b) or §80.520(a)(1). (i) Prior to October 15, 2008 an adjustment factor of negative three ppm sulfur shall be applied to the test results, to account for test variability, but only for testing of motor vehicle diesel fuel or NRLM diesel fuel identified as subject to the 15 ppm sulfur standard of §80.510(b) or §80.520(a)(1). (ii) [Reserved] (2) In addition to the adjustment factor provided in paragraph (d)(1)(i) of this section, prior to September 1, 2006, an adjustment factor of negative 7 ppm shall be applied to the test results from any testing of motor vehicle diesel fuel downstream of the refinery or import facility, to facilitate the transition to ULSD fuel, but only for testing of motor vehicle diesel fuel identified as subject to the 15 ppm sulfur standard of §80.520(a)(1). (3) In addition to the adjustment factor provided in paragraph (d)(1)(i) of this section, prior to October 15, 2006, an adjustment factor of negative 7 ppm shall be applied to the test results from any testing of motor vehicle diesel fuel at any retail outlet or wholesale purchaser-consumer facility, to facilitate the transition to ULSD fuel, but only for testing of motor vehicle diesel fuel identified as subject to the 15 ppm sulfur standard of §80.520(a)(1). (e) Materials incorporated by reference. The Director of the Federal Register approved the incorporation by reference of the document listed in this section as prescribed in 5 U.S.C. 552(a) and 1 CFR part 51.
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