Wikipedia statements that failed verification: chemistry, energy and industry

These are disputed statements under test, not facts this site asserts. Wikipedia editors tagged each one because the source cited for it did not appear to support it. Find what primary sources actually say and support or refute each statement as written; the cited sources listed below may be incomplete. Statement text is quoted from the linked Wikipedia articles under CC BY-SA 4.0.

1. "According to a German story, Fahrenheit actually chose the lowest air temperature measured..." from https://en.wikipedia.org/wiki/Fahrenheit (one source Wikipedia cited: https://web.archive.org/web/20131015045624/http://www.deutscher-wetterdienst.de/lexikon/index.htm?ID=L&DAT=Lufttemperatur)

2. "As of 2011 the world's known resources of uranium, economically recoverable at the arbitra..." from https://en.wikipedia.org/wiki/Nuclear_power (one source Wikipedia cited: https://web.archive.org/web/20130116084833/http://spp.nus.edu.sg/docs/policy-briefs/201101_RSU_PolicyBrief_1-2nd_Thought_Nuclear-Sovacool.pdf)

3. "Neither wrought iron nor mild steel contain enough carbon to be hardened by heating and qu..." from https://en.wikipedia.org/wiki/Wrought_iron

4. "Aspartame passes through wastewater treatment plants mainly unchanged...." from https://en.wikipedia.org/wiki/Aspartame (one source Wikipedia cited: https://doi.org/10.1007%2Fs00216-012-5892-z)

5. "A skilled harvester can cut 500 kg (1,100 lb) of sugarcane per hour...." from https://en.wikipedia.org/wiki/Sugarcane