Sorry to be "that guy" but are you sure it's Nitrite and not Nitrate? That mistake's been done before many times. Also, are you sure you measured out 10g because it sounds more like 10mg.
I agree with these thoughts. You'll know if you took 10g's of pure (i.e. 95% +) SN.
That said, the blood test you did sounded hopeful.
In my almost 2 years on here, the most common mistake I've seen make ppl make leading to them failing with SN is relying purely on a blood test. The blood test only indicates the presence of SN. But that could only be 50% purity, which the blood test won't tell you of course.
Even if the blood quickly turns brown, that still doesn't tell you it's strong SN due to the "cookie cutter effect" (CCE). CCE is basically when you break off a bit of cookie, you might wholly get a chocolate chunk to test...so the results might incorrectly lead you to believe you have a biscuit full of Choco. Whereas in reality you only have a cookie which it is only made up of c20% chocolate.
So if your SN is only 50% purity, for the blood test you might have unknowingly tested the 50% part which DID have the SN in. As apose to the 50% part which did NOT. Thus giving you a false impression your SN is good for ctb'ing. Whereas it is not. Hence why I would never solely rely on a blood test.
10g's should have done something like this to you;
https://sanctioned-suicide.net/threads/testing-sn-how-to-get-to-hospital-fast.74903/ (that guy only tested 2g's not 10g's!)