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I have read several studies concluding that plants can indeed take up molecules with a molecular weight larger than 390 g/mol. Does this mean plants do also take up large molecules like hormones if they are present in the soil?

study link: https://www.sciencedirect.com/science/article/pii/S004896971732332X

my conclusion for now: plants will take up large molecules from the roots, there are studies about it: https://www.sciencedirect.com/science/article/pii/S004896971732332X?fbclid=IwAR07SW3R9kWJXPBgTL_S6ZVQZMapTfRqHgPe0YNbmmdu1K9QYjsrO-0biHQ#f0015

They even take molecules larger than 563g/mol. (as concluded in the study)

It is also true that PVC that is often used in hydroponics releases hormone disruptors: https://en.wikipedia.org/wiki/Endocrine_disruptor?fbclid=IwAR0PGiqI2md5Fv_nDrFEBLCufeqIwU3FRhinfDBKuwN60WIgSFORuPQLsbY#Routes_of_exposure "In fact, almost all plastic products, including those advertised as "BPA free", have been found to leach endocrine-disrupting chemicals."

https://www.niehs.nih.gov/health/topics/agents/endocrine/index.cfm?fbclid=IwAR2J2-muRkyOZGj6Y7vb6fCFu-QjVOnu_0b74RJZw7Mj1kZyn1Yfw6ReUUQ

So actually it is true that hormone disruptors will end up in the plant cells of your crop eventually.

In addition to the information from wikipedia: remember that your PVC pipes will be subjected to diffrent acids, UV light, physical corrosion and heat impact. What is more than other plastic products are subjected to and they already leach endocrine-disruptors. Also if you take a look at endocrine-disruptors (https://en.wikipedia.org/wiki/Endocrine_disruptor) you will notice they are below 563g/mol meaning plant uptake is very likely.

what are your results?

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  • $\begingroup$ Molecular weight is unitless, molecular mass is measured in Da, so what is in your question is molar mass. Although you have provided your own attempt to answer this homework question it seems to be too reliant on reading external sources for anyone to answer. $\endgroup$ – David Aug 2 at 17:35

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