Transcription of 29 PRIMARY AND SECONDARY STANDARDS
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29 PRIMARY AND SECONDARY STANDARDS
BIOCHEMISTRYMODULEP rimary and SECONDARY StandardsBiochemistry 364 Notes29 PRIMARY AND INTRODUCTIONO ften in our life we come across the word standard . Whether it is the standardof bus service or behaviour or education, we use this term very commonly inour life. So why are we obsessed with standard? Is standard necessary in allspheres of our life? If the answer is yes then should we not follow a standardin our laboratory too? If yes, then next question arises how to prepare a standardin our reading this lesson, you will be able to:zdefine standardzexplain its useszclassify standard with proper examplezexplain various properties of STANDARDSIn Biochemistry, the word standard means a material containing a substance ofour interest with a known concentration.
zAnother example is potassium permanganate (KMnO 4) very often as secondary standard. It is a good oxidizing agent or in other words it is reactive so less stable. More often due to its reactivity, its own oxidized product manganese oxide (MnO 2) contaminates the content. That’s why it is unsuitable for being a primary standard.
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