折射率的溫度校正及換算為可溶性固形物含量

折射率的溫度校正及換算為可溶性固形物含量(補(bǔ)充件)如采用的折射儀不帶有可溶性固形物百分?jǐn)?shù)刻度，儀器校準(zhǔn)和樣液測定時(shí)，折射率的溫度校正及換算為可溶性固形物含量的方法如下。A1

用蒸餾水校準(zhǔn)折射儀讀數(shù)，在20℃時(shí)，折射率調(diào)至1.3330。溫度在15—25℃時(shí)，按表A1中的折射率校準(zhǔn)。A2

根據(jù)在20℃時(shí)，按檢測的樣液折射率讀數(shù)，由表A2查得可溶性固形物百分?jǐn)?shù)。測定時(shí)溫度不在20℃，需按下式先校正為20℃時(shí)的折射率：

N20Ｄ＝ntＤ＋０.00013(t-20)式中t為測定時(shí)的攝氏度

表A1

純水的折射率溫度℃折射率溫度℃折射率151.33339211.33290161.33332221.33281171.33334231.33272181.33316241.33263191.33307251.33253201.33299

表A2

20℃

時(shí)折射率與可溶性固形物換算表折射率可溶性固形物％折射率可溶性固形物％折射率可溶性固形物％折射率可溶性固形物％折射率可溶性固形物％折射率可溶性固形物％1.33300.01.354914.51.379329.01.406643.51.437358.01.471372.51.33370.51.355715.01.380229.51.407644.01.438558.51.472573.01.33441.01.356515.51.381130.01.408644.51.439659.01.473743.51.33511.51.357316.01.382030.51.409645.01.440759.51.474974.01.33592.01.358216.51.382931.01.410745.51.441860.01.476274.51.33672.51.359017.01.383831.51.411746.01.442960.51.477475.01.33733.01.359817.51.384732.01.412746.51.444161.01.478775.51.33813.51.360618.01.385632.51.413741.01.445361.51.479976.01.33884.0/1.361418.51.386533.01.414747.51.446462.01.481276.51.33954.51.362219.01.387433.51.415848.01.447562.51.482577.01.34035.01.363119.51.388334.01.416948.51.448663.01.483877.51.34115.51.363920.01.389334.51.417949.01.449763.51.485078.01.34186.01.364720.51.390235.01.418949.51.450964.01.486378.51.34256.51.365521.01.391135.51.420050.01.452164.51.487670.91.34337.01.366321.51.392036.01.421150.51.453265.01.488879.51.34417.51.367222.01.392936.51.422151.01.454465.51.490180.01.34488.01.368122.51.393937.01.423151.51.455566.01.491480.51.34568.51.368923.11.394937.51.424252.01.457065.51.492781.01.34649.01.369823.51.395838.01.425352.51.458167.51.494181.51.34719.51.370624.01.396838.51.426453.01.459367.51.495482.01.347910.01.371524.51.39739.01.427553.51.460568.01.496782.51.348710.51.372325.01.398739.51.428554.01.461668.51.498083.01.349411.01.373125.51.399740.51.429654.41.462869.01.499383.51.350211.51.374026.01.400740.51.430755.01.463969.51.500784.01.351012.01.374926.51.401641.01.431855.51.465170.01.502084.51.351812.51.375827.01.402641.51.432956.01.466370.51.503385.01.352613.01.376727.51.403642.01.434056.51.467671.