Reply on AC1

Опубликована: Сен. 2, 2022

Abstract. Tailpipe emissions from three heavy-duty diesel vehicles (HDDVs), complying with varying emission standards and installed diverse aftertreatment technologies, are collected at a certified chassis dynamometer laboratory. The HDDV-emitted intermediate-volatility semi-volatile organic compound (I/SVOC) the gas–particle partitioning of I/SVOCs investigated. Over 4000 compounds identified grouped into 21 categories. dominant groups particulate alkanes phenolic compounds. For HDDVs without devices, i.e., oxidation catalysts (DOCs) filters (DPFs), emitted partition dramatically gas phase (accounting for ∼ 93 % total I/SVOC mass), few exceptions: hopane, four-ring polycyclic aromatic hydrocarbons (PAH_4rings), five-ring class="inline-formula">_5rings). DPFs DOCs, fractions reduced to negligible level (i.e., less than 2 %). Nevertheless, 50 % two-ring PAH mass is detected in particle phase, which much higher high-molecular-weight PAHs, arising positive sampling artifact quartz filter absorbing vapors. vapors clearly observed, uncertainties discussed quantified. Particulate low-speed, middle-speed, high-speed phases analyzed separately. factor (EF) distribution speciated aerosol (OA) on two-dimensional volatility basis set (2D-VBS) space reveals that OA oxygen carbon (O : C) ratios class="inline-formula">> 0.3 (0.4, 0.5) 18.2 % (11.5 %, 9.5 %), 23 % (15.4 %, 13.6 %), 29.1 % (20.6 %, 19.1 %) stages. These results help resolve complex mixtures trace evolution OA.

Язык: Английский

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Reply on RC2

Опубликована: Сен. 2, 2022

Abstract. Tailpipe emissions from three heavy-duty diesel vehicles (HDDVs), complying with varying emission standards and installed diverse aftertreatment technologies, are collected at a certified chassis dynamometer laboratory. The HDDV-emitted intermediate-volatility semi-volatile organic compound (I/SVOC) the gas–particle partitioning of I/SVOCs investigated. Over 4000 compounds identified grouped into 21 categories. dominant groups particulate alkanes phenolic compounds. For HDDVs without devices, i.e., oxidation catalysts (DOCs) filters (DPFs), emitted partition dramatically gas phase (accounting for ∼ 93 % total I/SVOC mass), few exceptions: hopane, four-ring polycyclic aromatic hydrocarbons (PAH_4rings), five-ring class="inline-formula">_5rings). DPFs DOCs, fractions reduced to negligible level (i.e., less than 2 %). Nevertheless, 50 two-ring PAH mass is detected in particle phase, which much higher high-molecular-weight PAHs, arising positive sampling artifact quartz filter absorbing vapors. vapors clearly observed, uncertainties discussed quantified. Particulate low-speed, middle-speed, high-speed phases analyzed separately. factor (EF) distribution speciated aerosol (OA) on two-dimensional volatility basis set (2D-VBS) space reveals that OA oxygen carbon (O : C) ratios class="inline-formula">> 0.3 (0.4, 0.5) 18.2 (11.5 %, 9.5 %), 23 (15.4 13.6 29.1 (20.6 19.1 %) stages. These results help resolve complex mixtures trace evolution OA.

Язык: Английский

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Reply on RC3

Опубликована: Сен. 2, 2022

Abstract. Tailpipe emissions from three heavy-duty diesel vehicles (HDDVs), complying with varying emission standards and installed diverse aftertreatment technologies, are collected at a certified chassis dynamometer laboratory. The HDDV-emitted intermediate-volatility semi-volatile organic compound (I/SVOC) the gas–particle partitioning of I/SVOCs investigated. Over 4000 compounds identified grouped into 21 categories. dominant groups particulate alkanes phenolic compounds. For HDDVs without devices, i.e., oxidation catalysts (DOCs) filters (DPFs), emitted partition dramatically gas phase (accounting for ∼ 93 % total I/SVOC mass), few exceptions: hopane, four-ring polycyclic aromatic hydrocarbons (PAH_4rings), five-ring class="inline-formula">_5rings). DPFs DOCs, fractions reduced to negligible level (i.e., less than 2 %). Nevertheless, 50 % two-ring PAH mass is detected in particle phase, which much higher high-molecular-weight PAHs, arising positive sampling artifact quartz filter absorbing vapors. vapors clearly observed, uncertainties discussed quantified. Particulate low-speed, middle-speed, high-speed phases analyzed separately. factor (EF) distribution speciated aerosol (OA) on two-dimensional volatility basis set (2D-VBS) space reveals that OA oxygen carbon (O : C) ratios class="inline-formula">> 0.3 (0.4, 0.5) 18.2 % (11.5 %, 9.5 %), 23 % (15.4 %, 13.6 %), 29.1 % (20.6 %, 19.1 %) stages. These results help resolve complex mixtures trace evolution OA.

Язык: Английский

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Reply on RC2

Опубликована: Сен. 2, 2022

Abstract. Tailpipe emissions from three heavy-duty diesel vehicles (HDDVs), complying with varying emission standards and installed diverse aftertreatment technologies, are collected at a certified chassis dynamometer laboratory. The HDDV-emitted intermediate-volatility semi-volatile organic compound (I/SVOC) the gas–particle partitioning of I/SVOCs investigated. Over 4000 compounds identified grouped into 21 categories. dominant groups particulate alkanes phenolic compounds. For HDDVs without devices, i.e., oxidation catalysts (DOCs) filters (DPFs), emitted partition dramatically gas phase (accounting for ∼ 93 % total I/SVOC mass), few exceptions: hopane, four-ring polycyclic aromatic hydrocarbons (PAH_4rings), five-ring class="inline-formula">_5rings). DPFs DOCs, fractions reduced to negligible level (i.e., less than 2 %). Nevertheless, 50 two-ring PAH mass is detected in particle phase, which much higher high-molecular-weight PAHs, arising positive sampling artifact quartz filter absorbing vapors. vapors clearly observed, uncertainties discussed quantified. Particulate low-speed, middle-speed, high-speed phases analyzed separately. factor (EF) distribution speciated aerosol (OA) on two-dimensional volatility basis set (2D-VBS) space reveals that OA oxygen carbon (O : C) ratios class="inline-formula">> 0.3 (0.4, 0.5) 18.2 (11.5 %, 9.5 %), 23 (15.4 13.6 29.1 (20.6 19.1 %) stages. These results help resolve complex mixtures trace evolution OA.

Язык: Английский

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Reply on RC3

Опубликована: Сен. 2, 2022

Abstract. Tailpipe emissions from three heavy-duty diesel vehicles (HDDVs), complying with varying emission standards and installed diverse aftertreatment technologies, are collected at a certified chassis dynamometer laboratory. The HDDV-emitted intermediate-volatility semi-volatile organic compound (I/SVOC) the gas–particle partitioning of I/SVOCs investigated. Over 4000 compounds identified grouped into 21 categories. dominant groups particulate alkanes phenolic compounds. For HDDVs without devices, i.e., oxidation catalysts (DOCs) filters (DPFs), emitted partition dramatically gas phase (accounting for ∼ 93 % total I/SVOC mass), few exceptions: hopane, four-ring polycyclic aromatic hydrocarbons (PAH_4rings), five-ring class="inline-formula">_5rings). DPFs DOCs, fractions reduced to negligible level (i.e., less than 2 %). Nevertheless, 50 % two-ring PAH mass is detected in particle phase, which much higher high-molecular-weight PAHs, arising positive sampling artifact quartz filter absorbing vapors. vapors clearly observed, uncertainties discussed quantified. Particulate low-speed, middle-speed, high-speed phases analyzed separately. factor (EF) distribution speciated aerosol (OA) on two-dimensional volatility basis set (2D-VBS) space reveals that OA oxygen carbon (O : C) ratios class="inline-formula">> 0.3 (0.4, 0.5) 18.2 % (11.5 %, 9.5 %), 23 % (15.4 %, 13.6 %), 29.1 % (20.6 %, 19.1 %) stages. These results help resolve complex mixtures trace evolution OA.

Язык: Английский

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