Ich bin mir nicht ganz sicher, ob das Wortpaar überhaupt passt...
"recalcitrant compounds" ergibt sehr wenige Google-Treffer, und die, die gefunden werden, beschreiben es z. B. so:
"Microbial degradation of recalcitrant compounds and synthetic aromatic polymers
Marcel D. Faber∗
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The evolution of microbial catabolic enzymes cannot keep pace with the rapid introduction of novel compounds into the environment. These new synthetic compounds that are slowly biodegradable or non-biodegradable are known as recalcitrant compounds, and range from simple halogenated hydrocarbons to complex polymers. Recalcitrant compounds can be made biodegradable by developing microorganisms capable of degrading the compound and by treating the compound to make it more conducive to mirobial attack." http://www.sciencedirect.com/science/article/...
Der Artikel ist von 1979!
Das passt schlecht zu der Definition Altlast in #0, sondern läuft eher in Richtung "persistent organic pollutants", siehe z. B.
"Persistent organic pollutant
From Wikipedia, the free encyclopedia
Persistent organic pollutants (POPs) are organic compounds that are resistant to environmental degradation through chemical, biological, and photolytic processes. Because of their persistence, POPs bioaccumulate with potential significant impacts on human health and the environment. The effect of POPs on human and environmental health was discussed, with intention to eliminate or severely restrict their production, by the international community at the Stockholm Convention on Persistent Organic Pollutants in 2001.
Many POPs are currently or were in the past used as pesticides, solvents, pharmaceuticals, and industrial chemicals. Although some POPs arise naturally, for example volcanoes and various biosynthetic pathways, most are man-made."http://en.wikipedia.org/wiki/Persistent_organ...
Das deutsche Pendant wären dann die persistenten organischen Schadstoffe, aber das Wortpaar "persistent substance = abbauresistente Substanz, persistente Substanz" ist schon in LEO.