Gadolinium(III) chloride solution

Gadolinium(III) chloride solution, suitable for NMR (reference standard), 0.1 mg/mL in D?O (99.9 atom % D), Methanol-≠³C 0.1 % (99 atom % ≠³C), water 1 %, NMR tube size 3 mm × 8 in.