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Sodium alginate

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Textile printing grade sodium alginate
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Food grade sodium alginate

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pharmaceutical grade sodium alginate
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potassium alginate

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alginic acid

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mannitol
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Iodine
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Sodium alginate calcium content measurement method

Release date:2013-04-10


  1. Principle:
    After dissolving sodium alginate samples, Add sodium hydroxide solution pH greater than 12, at the same time add triethanolamine do masking agent, use calcium red do indicator, using the standard liquid EDTA complexometric titration of calcium, Use EDTA standard liquid agent consumption Calculation of calcium content .
  2. Reagent :
    The reagents used are analytical pure,Water is distilled water.
    ㈠.Sodium hydroxide solution 2 moi/L:Weighing the sodium hydroxide 8g, Dilute with water to 100mL.
    ㈡.Triethanolamine 10%:Measuring 10 ml triethanolamine,Add water dilute to 100mL.
    ㈢.EDTA standard solution 0.01moI/L:With reference to GB601 - 2002 4.15 preparation and calibration.
    ㈣.calcium red indicator2%:Take 2 g calcium red indicator,Add 100 g of solid sodium chloride, Mixed grind fine, On the brown bottle
  3. Measurement:
    Accurately weighed sample 0.5g (called a quasi to 0.002 g) put it in 250 ml beaker or tapered bottle, add 100 ml water solubility (heating) when necessary,Add 2 moI/L sodium hydroxide solution 5m/L,uniform mixing,Add 1 ml of 10% triethanolamine solution, 0.1 g of solid
    calcium red indicator,after dissolving, under continuous stirring,with 10 ml burette, 0.01 moI/L EDTA solution mutations to red to blue, As an end.
  4. The results calculated :
    calcium content Calculation formula :
    X6=( c×V×0.040 08)÷m9×100
    X6—— Calcium content in the sample ,unit as a percentage (%);
    c —— EDTA standard solution molar concentration,unit for moles per liter (moI/L);
    V—— The titration EDTA standard solution volume ,the unit is (mL);
    m9——The sample quality, Unit (g);
    0.040 08——And 1.00 mLEDTA standard solution [c(EDTA)=0.01moI/L]similar is expressed as mg of calcium quality.
  5. Repeatability:
    Each sodium alginate sample take for determination of two parallel samples, Take the arithmetic mean value as result.
    Two parallel samples results allows the relative deviation is less than 5%, Otherwise the redo.
Lianyungang huanyu seaweed co., LTD. Mainly produces sodium alginate
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