DOI: 10.1002/etc.5620140525. A proposal for the definition of resource equivalency factors for use in product life-cycle assessment

A proposal for the definition of resource equivalency factors for use in product life-cycle assessment

10.1002/etc.5620140525

Crossref journal-article

Oxford University Press (OUP)

Environmental Toxicology and Chemistry (286)

Abstract

Abstract Environmental life-cycle assessment (LCA) of products has been the focus of growing attention in the last few years. The methodological framework has been developed rapidly, and a provisional “Code of Practice” has been drawn up by an international group of experts. One of the elements of LCA is impact assessment, which includes a characterization step in which the contributions of resource extraction and polluting emissions to impact categories such as resource depletion, global warming, and acidification are quantified and aggregated as far as possible. This can be achieved by multiplying extractions and emissions by a so-called equivalency factor and aggregating the results in one or more effect score(s) per impact category. In this report a proposal is developed for equivalency factors indicating the relative depletion of a resource per unit extracted. It is proposed to measure depletion by physical data on reserves and production and regeneration rates, and to distinguish between abiotic and biotic resources. Equations are developed to calculate equivalency factors for these two categories of resources, resulting in so-called abiotic depletion potentials (ADP) and biotic depletion potentials (BDP). The application of these ADPs and BDPs in LCA is illustrated.

Bibliography

GuinÃ©e, J. B., & Heijungs, R. (1995). A proposal for the definition of resource equivalency factors for use in product life-cycle assessment. Environmental Toxicology and Chemistry, 14(5), 917â925.

Authors 2

Jeroen B. Guinée (first)
Reinout Heijungs (additional)

References 46 Referenced 101

{'volume-title': 'Guidelines for Life-Cycle Assessment: A Code of Practice', 'year': '1993', 'author': 'Consoli', 'key': '2025010614585849200_bib1'} / Guidelines for Life-Cycle Assessment: A Code of Practice by Consoli (1993)
{'volume-title': 'Environmental life cycle assessment of products. Guide & backgrounds—October 1992', 'year': '1992', 'author': 'Heijungs', 'key': '2025010614585849200_bib2'} / Environmental life cycle assessment of products. Guide & backgrounds—October 1992 by Heijungs (1992)
10.1016/0959-6526(93)90046-E / J. Cleaner Production / Quantitative life cycle assessment of products: Classification, valuation and improvement analysis by Guinée (1993)
{'volume-title': 'Key issues for toxicity assessment of a product life cycle', 'year': '1993', 'author': 'Wenzel', 'key': '2025010614585849200_bib4'} / Key issues for toxicity assessment of a product life cycle by Wenzel (1993)
{'volume-title': 'Data for the normalization step within life cycle assessment of products', 'year': '1993', 'author': 'Guinée', 'key': '2025010614585849200_bib5'} / Data for the normalization step within life cycle assessment of products by Guinée (1993)
{'volume-title': 'A technical framework for life cycle assessments', 'year': '1991', 'author': 'Fava', 'key': '2025010614585849200_bib6'} / A technical framework for life cycle assessments by Fava (1991)
{'year': '1992', 'author': 'Product Life Cycle Assessment—Principles and Methodology', 'key': '2025010614585849200_bib7'} by Product Life Cycle Assessment—Principles and Methodology (1992)
10.1016/0959-6526(93)90027-9 / J Cleaner Production / Quantitative life cycle assessment of products Goal definition and inventory by Guinée (1993)
{'volume-title': 'Environmental Assessment of Products A Course on Life Cycle Assessment', 'year': '1993', 'author': 'Pedersen', 'key': '2025010614585849200_bib9'} / Environmental Assessment of Products A Course on Life Cycle Assessment by Pedersen (1993)
{'volume-title': 'Life-cycle assessment Inventory guidelines and principles', 'year': '1993', 'author': 'Vigon', 'key': '2025010614585849200_bib10'} / Life-cycle assessment Inventory guidelines and principles by Vigon (1993)
{'key': '2025010614585849200_bib11', 'first-page': '81', 'volume-title': 'Headings for classification', 'author': 'Guinée', 'year': '1992'} / Headings for classification by Guinée (1992)
{'key': '2025010614585849200_bib12', 'first-page': '87', 'volume-title': 'Aggregation and operative units', 'author': 'Baumann', 'year': '1992'} / Aggregation and operative units by Baumann (1992)
{'key': '2025010614585849200_bib13', 'first-page': '172', 'volume-title': 'Product Life Cycle Assessment—Principles and Methodology', 'author': 'Finnveden', 'year': '1992'} / Product Life Cycle Assessment—Principles and Methodology by Finnveden (1992)
{'volume-title': 'Climate Change The IPCC Scientific Assessment', 'year': '1991', 'author': 'Houghton', 'key': '2025010614585849200_bib14'} / Climate Change The IPCC Scientific Assessment by Houghton (1991)
{'volume-title': 'Scientific assessment of stratospheric ozone', 'year': '1989', 'author': 'World Meteorological Organization', 'key': '2025010614585849200_bib15'} / Scientific assessment of stratospheric ozone by World Meteorological Organization (1989)
{'volume-title': 'Hydrocarbon involvement in photochemical ozone formation in Europe', 'year': '1990', 'author': 'Derwent', 'key': '2025010614585849200_bib16'} / Hydrocarbon involvement in photochemical ozone formation in Europe by Derwent (1990)
{'volume-title': 'Initial assessment of the hazards and risks of new chemicals to man and the environment', 'year': '1992', 'author': 'Vermeire', 'key': '2025010614585849200_bib17'} / Initial assessment of the hazards and risks of new chemicals to man and the environment by Vermeire (1992)
10.1016/0045-6535(93)90086-K / Chemosphere / A proposal for the classification of toxic substances within the framework of life cycle assessment of products by Guinée (1993)
{'issue': '4', 'key': '2025010614585849200_bib19', 'first-page': '4', 'article-title': 'CML on actual versus potential risks', 'volume': '3', 'author': 'Heijungs', 'year': '1993', 'journal-title': 'SETAC-Europe News'} / SETAC-Europe News / CML on actual versus potential risks by Heijungs (1993)
{'issue': '1', 'key': '2025010614585849200_bib20', 'first-page': '5', 'article-title': 'Experts need experts (II)', 'volume': '4', 'author': 'Assies', 'year': '1994', 'journal-title': 'SETAC-Europe News'} / SETAC-Europe News / Experts need experts (II) by Assies (1994)
{'issue': '3', 'key': '2025010614585849200_bib21', 'first-page': '6', 'article-title': 'The flux-pulse problem in LCA', 'volume': '4', 'author': 'Heijungs', 'year': '1994', 'journal-title': 'SETAC-Europe News'} / SETAC-Europe News / The flux-pulse problem in LCA by Heijungs (1994)
{'volume-title': 'A Conceptual Framework for Impact Assessment', 'year': '1993', 'author': 'Fava', 'key': '2025010614585849200_bib22'} / A Conceptual Framework for Impact Assessment by Fava (1993)
{'volume-title': 'Environmental science theory', 'year': '1992', 'author': 'de Groot', 'key': '2025010614585849200_bib23'} / Environmental science theory by de Groot (1992)
{'volume-title': 'Macro-environmental policy Principles and design', 'year': '1993', 'author': 'Huppes', 'key': '2025010614585849200_bib24'} / Macro-environmental policy Principles and design by Huppes (1993)
{'key': '2025010614585849200_bib25', 'first-page': '133', 'article-title': 'Duurzame ontwikkeling en het gebruik van niet-vernieuwbare hulpbronnen, in het bijzonder metalen', 'volume': '5', 'author': 'van der Meer', 'year': '1990', 'journal-title': 'Milieu'} / Milieu / Duurzame ontwikkeling en het gebruik van niet-vernieuwbare hulpbronnen, in het bijzonder metalen by van der Meer (1990)
{'volume-title': 'Measuring natural resource scarcity A study of the price indicator', 'year': '1993', 'author': 'Ozdemiroglu', 'key': '2025010614585849200_bib26'} / Measuring natural resource scarcity A study of the price indicator by Ozdemiroglu (1993)
{'volume-title': 'Methods for describing and characterising resource depletion in the context of life-cycle assessment', 'year': '1994', 'author': 'Finnveden', 'key': '2025010614585849200_bib27'} / Methods for describing and characterising resource depletion in the context of life-cycle assessment by Finnveden (1994)
{'volume-title': 'Mineral commodity summaries 1993', 'year': '1993', 'author': 'U.S. Department of the Interior—Bureau of Mines', 'key': '2025010614585849200_bib28'} / Mineral commodity summaries 1993 by U.S. Department of the Interior—Bureau of Mines (1993)
{'volume-title': 'Eindige grondstoffen, historie en globaal perspektief tot het jaar 2015', 'year': '1990', 'author': 'Mannaerts', 'key': '2025010614585849200_bib29'} / Eindige grondstoffen, historie en globaal perspektief tot het jaar 2015 by Mannaerts (1990)
{'key': '2025010614585849200_bib30', 'first-page': '13', 'volume-title': 'The meaning of resources', 'author': 'Tilton', 'year': '1987'} / The meaning of resources by Tilton (1987)
{'volume-title': 'De aarde als onze provisiekast, een inventarisatie van voorraden en hun onderlinge samenhang', 'year': '1993', 'author': 'Annema', 'key': '2025010614585849200_bib31'} / De aarde als onze provisiekast, een inventarisatie van voorraden en hun onderlinge samenhang by Annema (1993)
10.1021/ed050p306 / J Chem Educ / The origin of the chemical elements, 1 by Selbin (1973)
{'key': '2025010614585849200_bib33', 'volume-title': 'General Chemistry', 'author': 'Slabaugh', 'year': '1976', 'edition': '3rd ed'} / General Chemistry by Slabaugh (1976)
10.1038/310575a0 / Nature / Empirical approach to estimating the composition of the continental crust by Weaver (1984)
{'volume-title': 'Consider a Spherical Cow', 'year': '1988', 'author': 'Harte', 'key': '2025010614585849200_bib35'} / Consider a Spherical Cow by Harte (1988)
{'key': '2025010614585849200_bib36', 'volume-title': 'CRC Handbook of Chemistry and Physics', 'author': 'Lide', 'year': '1990', 'edition': '71st ed'} / CRC Handbook of Chemistry and Physics by Lide (1990)
{'volume-title': 'World Resources 1992–93, a Guide to the Global Environment', 'year': '1992', 'author': 'The World Resources Institute', 'key': '2025010614585849200_bib37'} / World Resources 1992–93, a Guide to the Global Environment by The World Resources Institute (1992)
{'key': '2025010614585849200_bib38', 'first-page': '54', 'article-title': 'Modelling the geochemical carbon cycle', 'volume': '259', 'author': 'Berner', 'year': '1989', 'journal-title': 'Sci Am'} / Sci Am / Modelling the geochemical carbon cycle by Berner (1989)
{'volume-title': 'Energy Policies and the Greenhouse Effect, Vol 2—Country Studies and Technical Options', 'year': '1991', 'author': 'Grubb', 'key': '2025010614585849200_bib39'} / Energy Policies and the Greenhouse Effect, Vol 2—Country Studies and Technical Options by Grubb (1991)
{'volume-title': 'Development of a methodology for the environmental life-cycle assessment of products', 'year': '1995', 'author': 'Guinée', 'key': '2025010614585849200_bib40'} / Development of a methodology for the environmental life-cycle assessment of products by Guinée (1995)
{'volume-title': 'World Resources 1990–91, a Guide to the Global Environment', 'year': '1990', 'author': 'The World Resources Institute', 'key': '2025010614585849200_bib41'} / World Resources 1990–91, a Guide to the Global Environment by The World Resources Institute (1990)
{'volume-title': 'Atlas of the Environment The Most Up to-Date Report on the State of the World', 'year': '1990', 'author': 'Lean', 'key': '2025010614585849200_bib42'} / Atlas of the Environment The Most Up to-Date Report on the State of the World by Lean (1990)
{'volume-title': "Conserving the world's biological diversity", 'year': '1990', 'author': 'McNeely', 'key': '2025010614585849200_bib43'} / Conserving the world's biological diversity by McNeely (1990)
{'volume-title': 'Minerals in the World Economy—1989', 'year': '1992', 'author': 'U.S. States Department of the Interior—Bureau of Mines', 'key': '2025010614585849200_bib44'} / Minerals in the World Economy—1989 by U.S. States Department of the Interior—Bureau of Mines (1992)
{'volume-title': 'Aanbod van en vraag naar metalen, ontwik kelingen, implicaties en relaties—een methodologische assessment omtrent substitutie van metalen', 'year': '1989', 'author': 'Moll', 'key': '2025010614585849200_bib45'} / Aanbod van en vraag naar metalen, ontwik kelingen, implicaties en relaties—een methodologische assessment omtrent substitutie van metalen by Moll (1989)
{'volume-title': 'SimaPro 1 0, system for the integral environmental analysis of products', 'year': '1991', 'author': 'Guinée', 'key': '2025010614585849200_bib46'} / SimaPro 1 0, system for the integral environmental analysis of products by Guinée (1991)

Dates

Type	When
Created	15 years, 5 months ago (March 17, 2010, 8:04 a.m.)
Deposited	7 months, 3 weeks ago (Jan. 6, 2025, 10:12 a.m.)
Indexed	7 months, 2 weeks ago (Jan. 7, 2025, 12:22 a.m.)
Issued	30 years, 3 months ago (May 1, 1995)
Published	30 years, 3 months ago (May 1, 1995)
Published Online	30 years, 3 months ago (May 1, 1995)
Published Print	30 years, 3 months ago (May 1, 1995)

Funders 0

None

BibTeX

@article{Guin_e_1995, title={A proposal for the definition of resource equivalency factors for use in product life-cycle assessment}, volume={14}, ISSN={1552-8618}, url={http://dx.doi.org/10.1002/etc.5620140525}, DOI={10.1002/etc.5620140525}, number={5}, journal={Environmental Toxicology and Chemistry}, publisher={Oxford University Press (OUP)}, author={Guinée, Jeroen B. and Heijungs, Reinout}, year={1995}, month=may, pages={917–925} }

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      "volume-title": "Key issues for toxicity assessment of a product life cycle",
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      "author": "Wenzel",
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      "volume-title": "Environmental Assessment of Products A Course on Life Cycle Assessment",
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      "volume-title": "Life-cycle assessment Inventory guidelines and principles",
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      "article-title": "Duurzame ontwikkeling en het gebruik van niet-vernieuwbare hulpbronnen, in het bijzonder metalen",
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      "author": "van der Meer",
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      "key": "2025010614585849200_bib30",
      "first-page": "13",
      "volume-title": "The meaning of resources",
      "author": "Tilton",
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      "year": "1993",
      "author": "Annema",
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      "author": "Selbin",
      "year": "1973",
      "journal-title": "J Chem Educ"
    },
    {
      "key": "2025010614585849200_bib33",
      "volume-title": "General Chemistry",
      "author": "Slabaugh",
      "year": "1976",
      "edition": "3rd ed"
    },
    {
      "key": "2025010614585849200_bib34",
      "doi-asserted-by": "crossref",
      "first-page": "575",
      "DOI": "10.1038/310575a0",
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      "author": "Weaver",
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