As a part of my doctoral research, I am testing soil samples for multiple elements (such as P, N, etc.). Because of COVID, I was not able to immediately test samples gathered in the field in the fall of 2020; instead, these samples have remained frozen. My question is - can I still get these samples tested, or has too much time passed? Another consideration is that the soil was quite wet when frozen, and large ice crystals have developed.
I'm returning to the field shortly, and will able to gather more samples, but ideally I would love to run these as well! Any help is appreciated.