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5 Qualitative Aspects of Analytical Chemistry
I Seminar 5.1
The Hydrogen Sulphide Scheme
• Learning objective
• To describe in detail the experimental procedure followed to identify metal
cations in a mixture by separation into groups using precipitation as
sulphides as the more relevant chemical tool (see Box 5.11).
• To become acquainted with practical solution chemistry through an analytical scheme that has been used by many generations of chemists in
qualitative analysis laboratories.
• Literature
Use of the books by Burns et al. (suggested reading no. 6) is advised.
• Tools needed
• The chemical tools typically used in Classical Qualitative Analysis.
• Group, identification and masking reagents, with special emphasis on H2S.
• Briefly discuss and comment on the basic (chemical) and applied aspects of
the scheme
• Preliminary tests.
• Scheme layout. Group distribution. Place special emphasis on separations.
• Ions involved.
• Why are they here?
• Identification reactions and their potential interferences.
• Critically compare this analytical scheme with other available choices for
inorganic cations
Seminar S.2
Global Assessment of Test Kits from a Specialized Manufacturer
(Merck)
• Learning objective
• To demonstrate the use of commercially available test kits for the rapid
identification and quantitation of organic and inorganic species (nonclinical parameters).
• To become acquainted with analytical tools of growing use.
• Material
The detailed instructions supplied by the kit manufacturer.
• Types of tests
(A) Use of human senses
A.I Reagent strips
(immobilized reagents)
A.2 Sample and blank vials
(added reagents)
5 Qualitative Aspects of Analytical Chemistry
I Seminar 5.1
The Hydrogen Sulphide Scheme
• Learning objective
• To describe in detail the experimental procedure followed to identify metal
cations in a mixture by separation into groups using precipitation as
sulphides as the more relevant chemical tool (see Box 5.11).
• To become acquainted with practical solution chemistry through an analytical scheme that has been used by many generations of chemists in
qualitative analysis laboratories.
• Literature
Use of the books by Burns et al. (suggested reading no. 6) is advised.
• Tools needed
• The chemical tools typically used in Classical Qualitative Analysis.
• Group, identification and masking reagents, with special emphasis on H2S.
• Briefly discuss and comment on the basic (chemical) and applied aspects of
the scheme
• Preliminary tests.
• Scheme layout. Group distribution. Place special emphasis on separations.
• Ions involved.
• Why are they here?
• Identification reactions and their potential interferences.
• Critically compare this analytical scheme with other available choices for
inorganic cations
Seminar S.2
Global Assessment of Test Kits from a Specialized Manufacturer
(Merck)
• Learning objective
• To demonstrate the use of commercially available test kits for the rapid
identification and quantitation of organic and inorganic species (nonclinical parameters).
• To become acquainted with analytical tools of growing use.
• Material
The detailed instructions supplied by the kit manufacturer.
• Types of tests
(A) Use of human senses
A.I Reagent strips
(immobilized reagents)
A.2 Sample and blank vials
(added reagents)