EM Quant® Tin Test, Catalog No. 10028
Test strips and reagent for the detection
and semi-quantitative determination of Tin ions
The Tin Test can be used as a rapid
semi-quantitative test for tin and tin compounds in electroplating
baths, reducing agents, stabilizers, catalysts, disinfectants,
fungicides and mordants used in the textile industry and, more
especially, in canned juices and preserves. Depending on the quality
of the tin plating, the edge of the can and the storage temperature,
significant quantities of tin may be absorbed by the product. Once a
can has been opened, its contents should be transferred to a more
suitable container. This also applies to evaporated milk. Tin levels
in foods should not exceed 25-50mg/l, though for reasons more of
taste than toxicity.
Principle of the Method
Divalent tin reacts with toluene-3,4-dithiol to
form a red dye. Tetravalent tin is reduced by adding a mixture of
0 - 10 - 25 - 50 - 100 - 200mg/l (ppm) SN2+
- Rinse the measuring vessel several times
with some of the sample solution and fill to the 5-ml mark.
- Add 13 drops of reagent (reducing mixture)
and swirl carefully to mix.
- Leave the solution to stand for 5 minutes.
- Immerse a test strip in the solution for 5
- Remove the test strip, wipe off any surplus
liquid by stroking the edge against the rim of the vessel and
compare the reaction zone with the color scale.
Keep the reagent (reducing mixture) away from
the skin (contains 32% hydrochloric acid and thioglycollic acid). In
the event of contact, rinse well immediately with plenty of water.
Seek immediate medical attention if substance enters the eye.
Influence of Anions and Cations
Any interference is most noticeable at the color
value of 25mg/l. The following list of interfering ions has been
drawn up for a tin ion content of 25mg/l.
The following ions interfere at concentrations
of above 25mg/l: Pb2+, Cu2+, Mo6+,
Pd4+, Hg+, Hg2+, Se4+,
Ag+, Bi3+, W6+
Above 100mg/l: Sb3+, Fe2+,
Above 500mg/l: As5+, Cd2+,
Ni2+, V5+, NO-2, S-2,
Above 1000mg/l: Cr3+, Co2+
No interference is caused by the presence of
1000mg/l of the following: Al3+, B3+, Ba2+,
Be2+, Ca2+, Ce3+, K+,
Li+, Mg2+, Mn2+, Rb+,
Sr2+, Th4+, Ti4+,U6+,
Zn2+, Zr4+, Na+, acetate, citrate,
tartrate, ascorbic acid, oxalic acid, CO2-3,
SO2-4, CN-, SCN-, Cl-,
F-, I-, Br-, PO3-4,
PO2-3, NO-3, SO2-3,
ClO-3, ClO-4, MnO-4, BrO-3,
Dissolve 0.19g of tin chloride in 31ml of 25%
hydrochloric acid and make up to 100ml with distilled water.
10028 EM Quant® Test strips and
Tin Test for 50 determinations