soil ph

This is my first grow sorta second. My first plant I tryd to grow died. So im trying again. Its a definite nitrogen toxicity. I flushed once but with was before transplanting into organic soil. I have sulfur thats also organic that I plan on using and I want to make it into a tea. Question is...

I was wondering, does galvanized metal change the pH of soil? Im thinking of putting up galvanized metal tomato fences around my ladies but Im scared that metal will mess up my pH. Please help! Thanks in advance 4 any help! =)