1、用密度测量法估测硫酸浓度(依据GB/T534-2002及GB/T11198.1-11198.15)本
方法
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仅适用于估测硫酸浓度时使用,且只适用于估测硫酸浓度小于98%(w)的产品。不能用估测值作为
分析
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测定结果。2、操作方法:根据样品的估计密度,选择一支量程合适的密度计,将其轻轻插入500ml量筒内的试样液体中心,使密度计慢慢下沉,注意勿使密度计与量筒壁相撞,静置1~2min,用一只眼睛沿液面水平方向直接读出温度计细管上的刻度值。对于透明液体,按弯月面下缘读数,对于不透明液体,按弯月面上缘读数。同时,用温度计测量液体温度,并按温度校正
表
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校正所需温度的密度值。硫酸密度与温度的关系:ρ20=ρt.【1+0.000025(20-t)-(20-t).K】ρt——测定时密度计指示的硫酸密度(g/cm3)ρ20---20℃时硫酸的密度(g/cm3)t—测定时的试样温度,℃0.000025---密度计玻璃膨胀系数K—-——试样密度的温度校正系数,由表1所示表1密度的温度校正系数密度/(g/cm3)校正系数K1.151~1.2000.00071.221~1.4200.00081.421~1.5600.00091.561~1.7000.00101.701~1.7700.00111.771~1.8400.0012三、根据算得的密度由表2查得20℃时相应硫酸浓度w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)1.15021.41.25033.81.35045.301.45055.41.55064.71.15522.01.25534.41.35545.801.45555.91.55565.11.16022.71.26035.01.36046.31.46056.41.56065.61.16523.31.26535.61.36546.91.46556.91.56566.01.17023.91.27036.21.37047.41.47057.41.57066.51.17524.61.27536.81.37547.91.47557.81.57566.91.18025.21.28037.41.38048.41.48058.31.58067.31.18525.81.28537.91.38549.01.48558.81.58567.81.19026.51.29038.51.39049.51.49059.21.59068.21.19527.11.29539.11.39550.01.49559.71.59568.71.20027.71.30039.71.40050.51.50060.201.60069.11.20528.31.30540.21.40551.01.50560.61.60569.51.21028.91.31040.81.41051.51.51061.11.61070.01.21529.61.31541.41.41552.01.51561.51.61570.41.22030.21.32041.91.42052.51.52062.01.62070.81.22530.81.32542.51.42553.01.52562.41.62571.21.23031.41.33043.11.43053.51.53062.91.63071.71.23532.01.33543.61.43554.01.53563.41.63572.11.24032.61.34044.21.44054.51.54063.81.64072.51.24533.21.34544.71.44555.01.54564.31.64572.9ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)ρ/(g/cm3)w(%)1.65073.41.69577.21.74081.21.78585.71.83093.61.65573.81.70077.61.74581.61.79086.31.83595.71.66074.21.70578.11.75082.11.79587.01.83697.01.66574.61.71078.51.75582.61.80087.71.67075.11.71578.91.76083.11.80588.41.67575.51.72079.41.76583.61.81089.21.68075.91.72579.81.77084.11.81590.101.68576.31.73080.21.77584.61.82091.101.69076.81.73580.71.78085.21.82592.2(注:文档可能无法思考全面,请浏览后下载,供参考。可复制、编制,期待你的好评与关注)