美国HACH哈希 30749 离子浓度校准液(价格优惠) 品牌:美国HACH哈希 品名:离子浓度校准液 货号:30749 参数大类:离子浓度校准液 浓度:10.00mg/L 体积:500mL 描述:Nitrogen-Nitrate as NO3--N (NIST) Nitrogen-Nitrate Standard Solution, 10 mg/L as NO?-N (NIST), 500 mL Bottle For accuracy checks and instrument calibrations in nitrate nitrogen determinations.