... reference substance (CoCl2 · 6 H2O) 0.6 g in 25 ml RongLiangPing, add water to dissolve, the capacity to moment degrees ... precision says the product solution take 200 mg in 10 ml RongLiangPing, add methanol, ultrasonic oscillations 30 min, cold to room ... to absorb the filtrate 2 ml in 10 ml RongLiangPing, plus methanol 3 ml, improved amino benzaldehyde 5 ml, densely plug, shake well, water ...