If the values of your samples are confined to a narrow range, compared to the range of what falls in that watershed over the course of a year, it could result in odd slopes with a small sample set. Is the range of values you obtained wide enough?
If snowmelt is involved, it could have an effect on your slope as well.
This is intriguing. I'll be watching for the water isotope experts' ideas.
On Sun, 15 Sep 2019 10:56:34 -0400
Leela <[log in to unmask]> wrote:
> I measured several ground water samples from a temperate region (Lat 42 deg). The hydrogen vs oxygen gives a slope of 3.5 and an intercept of -5. I can understand such a behavior from an arid region. Many samples from an nearby filed gave a slope of 7.7 and intercept of 11. Any suggestions