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) en Analysis of alcohol polyethoxylates and polyethylene glycols in marine sediments
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| 94 | "notes": "Alcohol polyethoxylates (AEOs) are the most commercially | 104 | "notes": "Alcohol polyethoxylates (AEOs) are the most commercially | ||
| 95 | important type of nonionic surfactants, used in a wide variety of | 105 | important type of nonionic surfactants, used in a wide variety of | ||
| 96 | products such as household cleaning detergents, industrial cleaners, | 106 | products such as household cleaning detergents, industrial cleaners, | ||
| 97 | textiles, adjuvants in pesticides, wetting and dispersing agents, and | 107 | textiles, adjuvants in pesticides, wetting and dispersing agents, and | ||
| 98 | emulsifiers. Our main objective in this work was to develop a | 108 | emulsifiers. Our main objective in this work was to develop a | ||
| 99 | methodology for the extraction, isolation and analysis of these | 109 | methodology for the extraction, isolation and analysis of these | ||
| 100 | compounds and their main degradation products and precursors | 110 | compounds and their main degradation products and precursors | ||
| 101 | (polyethylene glycols, PEGs) in solid environmental matrices. First, | 111 | (polyethylene glycols, PEGs) in solid environmental matrices. First, | ||
| 102 | analytes were extracted by pressurized liquid extraction (PLE) using | 112 | analytes were extracted by pressurized liquid extraction (PLE) using | ||
| 103 | methanol at 120 C as solvent and 3 cycles (5 min per cycle). Clean-up | 113 | methanol at 120 C as solvent and 3 cycles (5 min per cycle). Clean-up | ||
| 104 | and concentration of the extracts were carried out by solid-phase | 114 | and concentration of the extracts were carried out by solid-phase | ||
| 105 | extraction (SPE), using Oasis HLB cartridges and a mixture | 115 | extraction (SPE), using Oasis HLB cartridges and a mixture | ||
| 106 | dicloromethane/methanol 1:1 as eluting solvent. Recovery percentages | 116 | dicloromethane/methanol 1:1 as eluting solvent. Recovery percentages | ||
| 107 | were usually between 54% and 106% for most compounds. Identification | 117 | were usually between 54% and 106% for most compounds. Identification | ||
| 108 | and quantification of analytes were performed using a liquid | 118 | and quantification of analytes were performed using a liquid | ||
| 109 | chromatography-mass spectrometry (LC-MS) system equipped with an | 119 | chromatography-mass spectrometry (LC-MS) system equipped with an | ||
| 110 | electrospray interface (ESI) operating in positive ionization mode. | 120 | electrospray interface (ESI) operating in positive ionization mode. | ||
| 111 | Water content, cone voltage and adduct formation were optimized to | 121 | Water content, cone voltage and adduct formation were optimized to | ||
| 112 | this end. Limits of detection were usually below 50 ng g(-1), being | 122 | this end. Limits of detection were usually below 50 ng g(-1), being | ||
| 113 | higher for some shorter ethoxymers ( > 100 ng g(-1)) because of poor | 123 | higher for some shorter ethoxymers ( > 100 ng g(-1)) because of poor | ||
| 114 | ionization. Finally, the protocol proposed here was applied to the | 124 | ionization. Finally, the protocol proposed here was applied to the | ||
| 115 | determination of the concentration of AEOs and PEGs in selected | 125 | determination of the concentration of AEOs and PEGs in selected | ||
| 116 | surface sediment samples collected in Mar Menor Lagoon (Murcia, | 126 | surface sediment samples collected in Mar Menor Lagoon (Murcia, | ||
| 117 | Spain). In this sense, this paper presents some of the first data | 127 | Spain). In this sense, this paper presents some of the first data | ||
| 118 | relative to the occurrence of these analytes in coastal sediments, | 128 | relative to the occurrence of these analytes in coastal sediments, | ||
| 119 | showing relatively high concentrations of PEGs (up to 9000 ng g(-1)) | 129 | showing relatively high concentrations of PEGs (up to 9000 ng g(-1)) | ||
| 120 | compared to those measured for AEOs ( < 100 ng g(-1)). (C) 2013 | 130 | compared to those measured for AEOs ( < 100 ng g(-1)). (C) 2013 | ||
| 121 | Elsevier B.V. All rights reserved.", | 131 | Elsevier B.V. All rights reserved.", | ||
| 122 | "notes_translated": { | 132 | "notes_translated": { | ||
| 123 | "es": "Alcohol polyethoxylates (AEOs) are the most commercially | 133 | "es": "Alcohol polyethoxylates (AEOs) are the most commercially | ||
| 124 | important type of nonionic surfactants, used in a wide variety of | 134 | important type of nonionic surfactants, used in a wide variety of | ||
| 125 | products such as household cleaning detergents, industrial cleaners, | 135 | products such as household cleaning detergents, industrial cleaners, | ||
| 126 | textiles, adjuvants in pesticides, wetting and dispersing agents, and | 136 | textiles, adjuvants in pesticides, wetting and dispersing agents, and | ||
| 127 | emulsifiers. Our main objective in this work was to develop a | 137 | emulsifiers. Our main objective in this work was to develop a | ||
| 128 | methodology for the extraction, isolation and analysis of these | 138 | methodology for the extraction, isolation and analysis of these | ||
| 129 | compounds and their main degradation products and precursors | 139 | compounds and their main degradation products and precursors | ||
| 130 | (polyethylene glycols, PEGs) in solid environmental matrices. First, | 140 | (polyethylene glycols, PEGs) in solid environmental matrices. First, | ||
| 131 | analytes were extracted by pressurized liquid extraction (PLE) using | 141 | analytes were extracted by pressurized liquid extraction (PLE) using | ||
| 132 | methanol at 120 C as solvent and 3 cycles (5 min per cycle). Clean-up | 142 | methanol at 120 C as solvent and 3 cycles (5 min per cycle). Clean-up | ||
| 133 | and concentration of the extracts were carried out by solid-phase | 143 | and concentration of the extracts were carried out by solid-phase | ||
| 134 | extraction (SPE), using Oasis HLB cartridges and a mixture | 144 | extraction (SPE), using Oasis HLB cartridges and a mixture | ||
| 135 | dicloromethane/methanol 1:1 as eluting solvent. Recovery percentages | 145 | dicloromethane/methanol 1:1 as eluting solvent. Recovery percentages | ||
| 136 | were usually between 54% and 106% for most compounds. Identification | 146 | were usually between 54% and 106% for most compounds. Identification | ||
| 137 | and quantification of analytes were performed using a liquid | 147 | and quantification of analytes were performed using a liquid | ||
| 138 | chromatography-mass spectrometry (LC-MS) system equipped with an | 148 | chromatography-mass spectrometry (LC-MS) system equipped with an | ||
| 139 | electrospray interface (ESI) operating in positive ionization mode. | 149 | electrospray interface (ESI) operating in positive ionization mode. | ||
| 140 | Water content, cone voltage and adduct formation were optimized to | 150 | Water content, cone voltage and adduct formation were optimized to | ||
| 141 | this end. Limits of detection were usually below 50 ng g(-1), being | 151 | this end. Limits of detection were usually below 50 ng g(-1), being | ||
| 142 | higher for some shorter ethoxymers ( > 100 ng g(-1)) because of poor | 152 | higher for some shorter ethoxymers ( > 100 ng g(-1)) because of poor | ||
| 143 | ionization. Finally, the protocol proposed here was applied to the | 153 | ionization. Finally, the protocol proposed here was applied to the | ||
| 144 | determination of the concentration of AEOs and PEGs in selected | 154 | determination of the concentration of AEOs and PEGs in selected | ||
| 145 | surface sediment samples collected in Mar Menor Lagoon (Murcia, | 155 | surface sediment samples collected in Mar Menor Lagoon (Murcia, | ||
| 146 | Spain). In this sense, this paper presents some of the first data | 156 | Spain). In this sense, this paper presents some of the first data | ||
| 147 | relative to the occurrence of these analytes in coastal sediments, | 157 | relative to the occurrence of these analytes in coastal sediments, | ||
| 148 | showing relatively high concentrations of PEGs (up to 9000 ng g(-1)) | 158 | showing relatively high concentrations of PEGs (up to 9000 ng g(-1)) | ||
| 149 | compared to those measured for AEOs ( < 100 ng g(-1)). (C) 2013 | 159 | compared to those measured for AEOs ( < 100 ng g(-1)). (C) 2013 | ||
| 150 | Elsevier B.V. All rights reserved." | 160 | Elsevier B.V. All rights reserved." | ||
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