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(4)    Ca 2+ 与 EDTA 混合溶液中两者的测定

(4)    Ca 2+ 与 EDTA 混合溶液中两者的测定. Ca 2+ +EDTA + 钙指示剂 ( pH=12.5) 如果蓝色, Y 过量 : Ca 2+  CaY+ CaY (过量 Y ) ( 红 ) 如果红色, Ca 2+ 过量 Y  CaY+ CaY (过量 Ca 2+ )( 蓝 ) 另取一份: Ca 2+ +EDTA pH 5 六次甲基四胺 buffer Pb 2+  Ca 2+ +PbY c (Y) XO ( 黄 → 红 )

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(4)    Ca 2+ 与 EDTA 混合溶液中两者的测定

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  1. (4)    Ca2+与 EDTA混合溶液中两者的测定 Ca2+ +EDTA + 钙指示剂(pH=12.5) 如果蓝色, Y 过量 : Ca2+ CaY+ CaY(过量Y) (红) 如果红色, Ca2+过量 Y  CaY+ CaY(过量Ca2+)(蓝) 另取一份: Ca2++EDTA pH 5 六次甲基四胺 buffer Pb2+ Ca2++PbY c(Y) XO (黄 →红) 则c(Ca)=c(Y)+c(Ca)过或c(Ca)= c(Y)-c(Y)过

  2. (5) 水泥中Fe3+、Al3+、Ca2+、 Mg2+的测定 Fe3+ FeY FeY Al3+ pH 2.0 Y  Al3+pH 3, Y过量 AlY+Y(剩) Ca2+  SSal Ca2+ Mg2+ (red) Mg2+(Colorless) 测Fe 六次甲基四胺pH5 Zn  AlY 测Al XO (yellow) ZnY (red) 另取一份: Fe3 Al3+酸性,三乙醇胺 Ca2+ pH 10, NH3 buffer Y  CaY Ca2+ (掩蔽Fe3+、Al3+) Mg2+ EBT MgY Mg2+ (purplish red) (blue) 测Ca2++Mg2+

  3. 再取一份: Fe3+ Al3+酸性,三乙醇胺 Ca2+ pH 12.5 Y  CaY Ca2+ (掩蔽Fe3+、Al3+)Mg2+钙指示剂 Mg(OH)2测Ca Mg2+ (purplish red) (blue)

  4. (6) Al3+、 Zn2+、 Mg2+混合液中 Zn2+的测定 Al3+ AlF63- Zn3+ pH 3 pH 5.5, 六buffer EDTA ZnY Mg2+ F- XO MgF2 ↓ (红) (黄)

  5. (7)Bi3+、 Al3+、 Pb2+混合液中三组分的测定 Bi3+ BiYBiY BiY Al3+ Y Al3+pH 3, Y过量AlY pH 5-6, 六bufferZn2+ AlY Pb2 + pH 1, XO Pb2+  PbY XO PbY (red) (yellow) Y (red) 测Bi 测Al+Pb NaF AlF63- +Y Zn2+ ZnY  PbY 测Al (yellow) (red)

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