默克一级代理 色谱纯乙腈

'项目 色谱纯 （for HPLC, ≥99.9%） 纯度Purity ≥99.9% λ H2O reference 紫外吸收UV absorption λ: 195 nm ≤0.100 λ: 200 nm ≤0.020 λ: 228 nm ≤0.005 透光度transmittance 195 nm, ≥80% 200 nm, ≥95% 228 nm, ≥99% 游离碱free alkali (as NH3) ≤0.0001% 非挥发性物质non-volatile matter ≤0.0002% 游离酸free acid (as CH3COOH) ≤0.001% 水water (Karl Fischer) ≤0.01% 基线漂移baseline drift, (210 nm) ≤12 mAU 荧光奎宁fluorescence (quinine) at 254 nm ≤0.5 ppb 荧光奎宁fluorescence (quinine) at 365 nm ≤0.5 ppb 卤化残留halogenated residue 10 ng/L (as heptachlor epoxide) UV absorption HPLC-gradient/210 nm ≤1 mAU HPLC-gradient/254 nm ≤0.2 mAU'