Advance Science Institute Conductivity of Water Chemistry Worksheet

Conductivity of waterNi plated stainless steel electrodes in tap-water
Tap water
550 mV excitation
Interval 10uS
Tap water + salt
550 mV excitation
10 uS
Question
Explain the why salt increases the
amplitude of the signal response.
Propose a method to calculate the
change in the resistance or
capacitance of the solution.
ICP LAB ASSIGNMENTS
Lab report on ICP (Submit doc and xl files)
1. Experimental: Describe the instrument (https://www.spectro.com/products/icp-oes-ae
2. Results and discussion
Use the standards to get calibration plots. Do regression and find the slope, intercept, and
Calculate the detection limits for the elements.
Find the concentration of the assigned elements in the unknown and the errors.
Relevant discussion as appropriate
(watchout for significant figures)
ICP DATA FOR STANDARDS AND UNKNOWNS
SIGNAL IN
cps- counts per second
Elements and peak wavenegth in nm
Intensity
Sample
Pb
Sb
220.353 206.833
ug/L
BLANK
Standard 1
Standard 2
Standard 3
Standard 4
Standard 5
CHM 3042 Unknown 1
Water from PineRidge
Water from Syskyon Mt
Water from Didiyma
Water from Italy
Spring 2021 Unknown1
Spring 2021 Unknown 3
Black salt
Pink Salt
0.0
10.0
50.0
100.0
200.0
500.0
34.097
72.053
197.19
333.48
621.77
1562
86.686
5.502
18.997
17.961
19.827
66.169
235.95
36.553
28.729
6.3
38.007
4.611
44.825
24.927
69.435
57.194
93.848
177.781
163.54
304.38 384.383
1.01
48.294
-14.123
36.122
18.836
14.722
8.819
25.848
6.441
38.153
-12.867
49.504
20.631
90.224
-26.933
32.47
-15.254
22.849
Data analysis example
SAMPLE
As(ug/L)
Se
196.090
As 228.812
Signal (cps)
Blank3 HNO3
Standard 1
Standard 2
Standard 3
Standard 4
Standard 5
0.0
10.0
50.0
100.0
200.0
500.0
92.246
88.734
115.53
171.25
226.92
449.57
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
m/products/icp-oes-aes-spectrometers/arcos-inductively-coupled-plasma)
he slope, intercept, and the errors.
d the errors.
Intensity
Si
Sn
251.612 189.991
34443.6 45.198
1331.82
46.07
4100.29 59.339
7128.84 79.254
13164.9 112.595
59388.5 268.377
4625.35 50.874
449439 66.532
220891 68.275
153293
55.66
473200 62.859
1477.51 56.745
6319.82 70.532
41254.5 80.031
76901.6
59.94
As
(delete negative intensities)
As
0.2
0.4
0.6
0.8
1

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