Sensing Application — Construction of a high-performance electrochemical sensor based on intrinsically conductive Co-HHTQ-MOF for imidacloprid detection

5 measurement groups · 25 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

Differential pulse voltammetry (DPV) calibration for imidacloprid

Voltammetry

Co-HHTQ-MOF/GCE · Electrode

Co-HHTQ-MOF/GCE in 0.1 M PBS pH 7.0 with increasing IMI concentration.

Geometry: Co-HHTQ-MOF/GCE sensor electrode
Context: Co-HHTQ-MOF/GCE composite sensor
Measurement source: 7 · Determination of IMI · Fig. 3A-B

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
DPV calibration intercept	2.11 x 10^-7 A	2.11e-7 A	—	Text Exact Reported	7 · Determination of IMI · Fig. 3B
DPV calibration R2	R2 = 0.990	0.99	—	Text Exact Reported	7 · Determination of IMI · Fig. 3B
DPV calibration slope	5.45 x 10^-6 A/nM	0.00000545 A nM^-1	—	Text Exact Reported	7 · Determination of IMI · Fig. 3B
Linear IMI detection rangeMarked as a best value within this paper	0.4-30 nM	—	—	Text Range	7 · Determination of IMI · Fig. 3A-B
Limit of detection for IMIMarked as a best value within this paper	0.086 nM (S/N = 3)	0.086 nM	S/N = 3	Text Exact Reported	7 · Determination of IMI · Fig. 3B
Sensor sensitivityMarked as a best value within this paper	0.120 uA nM-1 cm-2	0.12 uA nM^-1 cm^-2	—	Calculated From Reported Rounded Reported	7 · Determination of IMI · Fig. 3B
SI Table S2 current-work method-comparison row	Co-HHTQ-MOF/GCE: LOD 0.086 nM; linear range 0.4-30 nM; measuring technique DPV; Ref. This work	0.086 nM	—	SI Table Exact Reported	5 · Comparison of Methods for Detecting Imidacloprid (IMI) · Table S2

Anti-interference/selectivity test

Co-HHTQ-MOF/GCE · Electrode

PBS 0.1 M pH 7.0; ions at 0.5 mM and pesticides at 0.5 mM, with and without 30 nM IMI.

Geometry: Co-HHTQ-MOF/GCE sensor electrode
Context: Co-HHTQ-MOF/GCE composite sensor
Measurement source: 7-8 · Repeatability, stability and anti-interference · Fig. 4C-D

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Current variation with interferents and IMIMarked as a best value within this paper	remained within 5%	5 %	—	Text Approximate	7 · Repeatability, stability and anti-interference · Fig. 4D
Current response from interferents without IMIMarked as a best value within this paper	all below 1%	1 %	—	Text Approximate	7 · Repeatability, stability and anti-interference · Fig. 4C

Standard addition recovery in food samples with HPLC comparison

Co-HHTQ-MOF/GCE · Electrode

Tomato, grape and corn samples homogenised/filtered/diluted 100-fold in PBS 0.1 M pH 7.0, fortified with IMI, and measured by Co-HHTQ-MOF/GCE and HPLC reference.

Geometry: Co-HHTQ-MOF/GCE sensor electrode
Context: Co-HHTQ-MOF/GCE composite sensor
Measurement source: 3,8 · Preparation of samples; Practical application · Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Corn recovery, 10 nM spike	Found 10.534 +/- 0.051 nM; recovery 105.34%; HPLC 10.840 +/- 0.289 nM	105.34 %	found +/-0.051 nM; HPLC +/-0.289 nM	Table Exact Reported	8 · Practical application · Table 1
Corn recovery, 20 nM spike	Found 21.061 +/- 0.309 nM; recovery 105.30%; HPLC 20.759 +/- 0.201 nM	105.3 %	found +/-0.309 nM; HPLC +/-0.201 nM	Table Exact Reported	8 · Practical application · Table 1
Corn recovery, 30 nM spike	Found 29.076 +/- 0.421 nM; recovery 96.92%; HPLC 30.838 +/- 0.298 nM	96.92 %	found +/-0.421 nM; HPLC +/-0.298 nM	Table Exact Reported	8 · Practical application · Table 1
Corn recovery, 40 nM spike	Found 39.508 +/- 0.185 nM; recovery 98.77%; HPLC 39.334 +/- 0.172 nM	98.77 %	found +/-0.185 nM; HPLC +/-0.172 nM	Table Exact Reported	8 · Practical application · Table 1
Grape recovery, 10 nM spike	Found 9.661 +/- 0.054 nM; recovery 96.61%; HPLC 10.615 +/- 0.318 nM	96.61 %	found +/-0.054 nM; HPLC +/-0.318 nM	Table Exact Reported	8 · Practical application · Table 1
Grape recovery, 20 nM spike	Found 21.156 +/- 0.294 nM; recovery 106.28%; HPLC 20.387 +/- 0.233 nM	106.28 %	found +/-0.294 nM; HPLC +/-0.233 nM	Table Exact Reported	8 · Practical application · Table 1
Grape recovery, 30 nM spike	Found 31.013 +/- 0.404 nM; recovery 103.38%; HPLC 31.329 +/- 0.231 nM	103.38 %	found +/-0.404 nM; HPLC +/-0.231 nM	Table Exact Reported	8 · Practical application · Table 1
Grape recovery, 40 nM spike	Found 39.674 +/- 0.449 nM; recovery 99.12%; HPLC 39.186 +/- 0.271 nM	99.12 %	found +/-0.449 nM; HPLC +/-0.271 nM	Table Exact Reported	8 · Practical application · Table 1
Overall recovery range reported in text	103.68% to 108.54%	—	—	Text Range	7 · Practical application · Table 1
Tomato recovery, 10 nM spike	Found 10.001 +/- 0.149 nM; recovery 100.01%; HPLC 10.543 +/- 0.068 nM	100.01 %	found +/-0.149 nM; HPLC +/-0.068 nM	Table Exact Reported	8 · Practical application · Table 1
Tomato recovery, 20 nM spike	Found 21.280 +/- 0.231 nM; recovery 106.40%; HPLC 20.590 +/- 0.072 nM	106.4 %	found +/-0.231 nM; HPLC +/-0.072 nM	Table Exact Reported	8 · Practical application · Table 1
Tomato recovery, 30 nM spike	Found 31.693 +/- 0.100 nM; recovery 105.63%; HPLC 31.307 +/- 0.111 nM	105.63 %	found +/-0.100 nM; HPLC +/-0.111 nM	Table Exact Reported	8 · Practical application · Table 1
Tomato recovery, 40 nM spike	Found 38.214 +/- 0.143 nM; recovery 95.53%; HPLC 39.179 +/- 0.339 nM	95.53 %	found +/-0.143 nM; HPLC +/-0.339 nM	Table Exact Reported	8 · Practical application · Table 1

Repeatability by consecutive CV measurements

Voltammetry

Co-HHTQ-MOF/GCE · Electrode

50 consecutive measurements of current response to 30 nM IMI at Co-HHTQ-MOF/GCE.

Geometry: Co-HHTQ-MOF/GCE sensor electrode
Context: Co-HHTQ-MOF/GCE composite sensor
Measurement source: 7-8 · Repeatability, stability and anti-interference · Fig. 4A

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Repeatability test count	50 consecutive measurements	50 measurement	—	Text Exact Reported	7 · Repeatability, stability and anti-interference · Fig. 4A

Operational stability test

Co-HHTQ-MOF/GCE · Electrode

Detection of 30 nM IMI over 10 days.

Geometry: Co-HHTQ-MOF/GCE sensor electrode
Context: Co-HHTQ-MOF/GCE composite sensor
Measurement source: 7-8 · Repeatability, stability and anti-interference · Fig. 4B

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Stability duration	10 days	10 day	—	Text Exact Reported	7 · Repeatability, stability and anti-interference · Fig. 4B
Current-signal variation over 10 daysMarked as a best value within this paper	within a 10% variation range	10 %	—	Text Rounded Reported	7 · Repeatability, stability and anti-interference · Fig. 4B