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當(dāng)前位置：首頁新聞中心簡述PH標(biāo)度

簡述PH標(biāo)度

更新時(shí)間：2017-11-23點(diǎn)擊次數(shù)：1878

pH測量是一種相對測量，它僅僅指示標(biāo)準(zhǔn)溶液與未知溶液之間的pH差別，實(shí)際測量時(shí)，需要用標(biāo)準(zhǔn)緩沖溶液定期進(jìn)行校準(zhǔn)。因此，為了達(dá)到量值的一致，必須建立pH標(biāo)度。pH標(biāo)度范圍定為0～14pH，pH標(biāo)度的量值由基準(zhǔn)緩沖溶液的pHs值確定。因此，pH標(biāo)度的含義可表達(dá)為：根據(jù)pH定義，在0～14pH范圍內(nèi)選擇若干個(gè)pH緩沖溶液作為pH標(biāo)度的固定點(diǎn)，并且采用當(dāng)代技術(shù)能達(dá)到的zui準(zhǔn)確的方法測定它們的pHs值。上有二種pH標(biāo)度，即多種基準(zhǔn)pH標(biāo)度和單種基準(zhǔn)pH標(biāo)度，中國采用多種基準(zhǔn)pHs標(biāo)度。六種基準(zhǔn)緩沖溶液0～95℃的pHs值見表(1).
 表(1) 六種基準(zhǔn)緩沖溶液的pHs值

 溫度，℃

 B1

 B3

 B4

 B6

 B9

 B12

 0

 1.668

 ----

 4.006

 6.981

 9.458

 13.416

 5

 1.669

 ----

 3.999

 6.949

 9.391

 13.210

 10

 1.671

 ----

 3.996

 6.921

 9.330

 13.011

 15

 1.673

 ----

 3.996

 6.898

 9.276

 12.820

 20

 1.676

 ----

 3.998

 6.879

 9.226

 12.637

 25

 1.680

 3.559

 4.003

 6.864

 9.182

 12.460

 30

 1.684

 3.551

 4.010

 6.852

 9.142

 12.292

 35

 1.688

 3.547

 4.019

 6.844

 9.105

 12.130

 40

 1.694

 3.547

 4.029

 6.838

 9.072

 11.975

 45

 1.700

 3.550

4.042

 6.834

 9.042

 11.828

 50

 1.706

 3.555

 4.055

 6.833

 9.015

 11.697

 55

 1.713

 3.563

 4.070

 6.834

 8.990

 11.553

 60

 1.721

 3.573

 4.087

 6.837

 8.968

 11.426

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