| dc.description.abstract | Many deaths are caused by cyanide, so a simple analytical method is needed
to determine the presence of cyanide in a sample. Incorrect handling and analysis
can cause its validity to have weaknesses. Laboratory investigation has been
developed and consists of several stages, includes documentation, preparation and
analysis techniques, developed in the analysis of unknown samples to simplify
analysis. The purpose of this study was to prepare and extract cyanide from sample
of ready to drink drinks namely mineral water, tea and coffee by laboratory
investigation and analyze the cyanide extracted. The process of preparing mineral
water, tea and coffee was carried out by collecting and measuring each sample. Then
made a solution of 100 ppm cyanide. Extraction is done by centrifugation.
Presumptive test with color testing method using picrate paper. Quantitative analysis
by viscosity test, density test and spectrophotometry method. The result obtained
from the positive presumptive test contained cyanide in mineral water, tea and coffee
which was marked by a change in color from yellow to brick red on filter paper.
Viscosity test on mineral water, tea and coffee with the addition of cyanide obtained
successive result of 1,0859; 1,2645; 3,5218 and without cyanide obtained successive
result of 1,1599; 1,310; 3,7405. Density tests on mineral water, tea and coffee with
the addition of cyanide and without cyanide obtained successive result of 0,9661;
1,0051; 1,0196; 0,9862; 1,0157 and 1,0468. From the data obtained mineral water.
tea and coffee containing cyanide had lower viscosity and density than those without
cyanide. Analysis by spectrophotometry obtained cyanide content in mineral water,
tea and coffee respectivelly 98,75 ppm, 92,25 ppm, and 8,9 ppm. | en_US |
