Sensing Application — A novel pencil graphite electrode modified with an iron-based conductive metal-organic framework exhibited good ability in simultaneous sensing bisphenol A and bisphenol S

8 measurement groups · 57 results

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

cyclic voltammetry for BPA and BPS

Voltammetry

Fe-HHTP/PGE · Electrode

50 uM BPA and BPS, scan rate 100 mV s-1, potential range -0.2 to 0.8 V; single and binary systems.

Geometry: Fe-HHTP/PGE working electrode with SCE reference and PWE counter
Context: primary Fe-HHTP/PGE sensor with control electrodes
Measurement source: 3,6,7 · 2.3; 3.3 · Fig. 3A-B

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
BPA oxidation peak potential in binary CV	about +0.468 V	—	about	Text Approximate	6 · 3.3 · Fig. 3A
BPA/BPS binary peak separation	0.283 V	—	—	Text Exact Reported	6 · 3.3 · Fig. 3A
BPA oxidation peak potential in single-analyte CV	about +0.477 V	—	about	Text Approximate	6 · 3.3 · Fig. 3A
BPS oxidation peak potential in binary CV	about +0.751 V	—	about	Text Approximate	6 · 3.3 · Fig. 3A
BPS oxidation peak potential in single-analyte CV	about +0.747 V	—	about	Text Approximate	6 · 3.3 · Fig. 3A

cyclic voltammetry scan-rate study and Laviron analysis

Voltammetry

Fe-HHTP/PGE · Electrode

Scan rates 0.02 to 0.22 V s-1 for 50 uM BPA and BPS; Ip-v and Ep-ln(v) fitted.

Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor
Measurement source: 3,6,7 · 2.3; 3.3 · Fig. 3C-E

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
BPA transferred-electron number from Laviron analysis	n = 2.48	—	—	Calculated From Reported Exact Reported	6 · 3.3 · Fig. 3E
BPA Ep versus ln(v) regression	Ep = 0.0207 Lnv + 0.5009; R2 = 0.9972	—	R2 = 0.9972	Text Exact Reported	6 · 3.3 · Fig. 3E
BPA Ip versus scan-rate regression	Ip = 264.03 v + 2.3572; R2 = 0.9984	—	R2 = 0.9984	Text Exact Reported	6 · 3.3 · Fig. 3D
BPS transferred-electron number from Laviron analysis	n = 1.95	—	—	Calculated From Reported Exact Reported	6 · 3.3 · Fig. 3E
BPS Ep versus ln(v) regression	Ep = 0.0264 Lnv + 0.7918; R2 = 0.9935	—	R2 = 0.9935	Text Exact Reported	6 · 3.3 · Fig. 3E
BPS Ip versus scan-rate regression	Ip = 198.46 v + 6.6372; R2 = 0.9994	—	R2 = 0.9994	Text Exact Reported	6 · 3.3 · Fig. 3D

differential pulse voltammetry (DPV) calibration

Voltammetry

Fe-HHTP/PGE · Electrode

Optimised conditions: pH 6.5, Fe-HHTP concentration 2 mg mL-1, deposition potential 0 V, deposition time 100 s; BPA/BPS concentration 0.01-100 uM.

Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor
Measurement source: 7,8,9 · 3.5 · Fig. 5; Table 1

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
BPA high-concentration calibration slope	Ip = 0.3853 CBPA + 14.2844; R2 = 0.9985 at 1-100 uM	—	R2 = 0.9985	Text Exact Reported	8 · 3.5 · Fig. 5B
BPA linear detection rangeMarked as a best value within this paper	0.01-100 uM	—	—	Text Range	8,9 · 3.5 · Fig. 5B; Table 1
BPA low-concentration calibration slope	Ip = 14.0496 CBPA + 0.6074; R2 = 0.9936 at 0.01-1 uM	—	R2 = 0.9936	Text Exact Reported	7 · 3.5 · Fig. 5B
BPS high-concentration calibration slope	Ip = 0.3031 CBPS + 8.8530; R2 = 0.9975 at 1-100 uM	—	R2 = 0.9975	Text Exact Reported	8 · 3.5 · Fig. 5B
BPS linear detection rangeMarked as a best value within this paper	0.01-100 uM	—	—	Text Range	8,9 · 3.5 · Fig. 5B; Table 1
BPS low-concentration calibration slope	Ip = 9.0627 CBPS + 0.2400; R2 = 0.9993 at 0.01-1 uM	—	R2 = 0.9993	Text Exact Reported	7 · 3.5 · Fig. 5B
BPA limit of detectionMarked as a best value within this paper	0.8 nM; S/N = 3	0.0008 uM	S/N = 3	Table Exact Reported	8,9 · Abstract; 3.5 · Table 1
BPS limit of detectionMarked as a best value within this paper	1.7 nM; S/N = 3	0.0017 uM	S/N = 3	Table Exact Reported	8,9 · Abstract; 3.5 · Table 1

CV response comparison of M-HHTP controls

Voltammetry

Fe-HHTP powder · Powder

Fe-HHTP compared with M-HHTP (M=Co, Ni, Cu or Zn) for simultaneous detection of BPA and BPS; values shown in radar plot.

Geometry: electrode format not fully specified for control MOFs
Context: Fe-HHTP versus metal-HHTP control MOFs
Measurement source: 7 · 3.3 · Fig. 3F

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
best M-HHTP metal for BPA/BPS Ip responseMarked as a best value within this paper	Fe-HHTP showed the greatest effect on Ip among Fe, Co, Ni, Cu, and Zn-HHTP	—	—	Qualitative Qualitative	6,7 · 3.3 · Fig. 3F

CV optimisation of pH, Fe-HHTP concentration, deposition potential, and deposition time

Voltammetry

Fe-HHTP/PGE · Electrode

pH 5.0-8.0; CFe-HHTP 0.5-4 mg mL-1; deposition potential -0.2 to 0.3 V; deposition time 10-150 s.

Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor optimisation
Measurement source: 3,6,7,8 · 2.3; 3.4 · Fig. 4A-F

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
optimal deposition potentialMarked as a best value within this paper	0 V	—	—	Text Exact Reported	7 · 3.4 · Fig. 4E
optimal deposition timeMarked as a best value within this paper	100 s	—	—	Text Exact Reported	7 · 3.4 · Fig. 4F
optimal Fe-HHTP coating dispersion concentrationMarked as a best value within this paper	2 mg mL-1	—	—	Text Exact Reported	7,10 · 3.4; 4 · Fig. 4D
optimal pH for BPA/BPS detectionMarked as a best value within this paper	pH 6.5	—	—	Text Exact Reported	6 · 3.4 · Fig. 4C
BPA Ep-pH slope	60 mV pH-1	0.06 V pH-1	—	Text Rounded Reported	6 · 3.4 · Fig. 4B
BPS Ep-pH slope	57 mV pH-1	0.057 V pH-1	—	Text Rounded Reported	6 · 3.4 · Fig. 4B

standard addition recovery in plastic food packaging extracts

Fe-HHTP/PGE · Electrode

Polycarbonate bottles and disposable fast-food boxes extracted with methanol at 65 deg C for 24 h, concentrated, diluted in PBS, deoxygenated with nitrogen, analysed by Fe-HHTP/PGE and compared with HPLC.

Atmosphere: nitrogen deoxygenation before electrochemical analysis
Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor applied to real samples
Measurement source: 5,9,10 · 2.5; 3.7 · Table 3

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
BPA originally detected in polycarbonate bottles	0.72 uM	—	—	Table Exact Reported	9,10 · 3.7 · Table 3
BPS originally detected in polycarbonate bottles	1.05 uM	—	—	Table Exact Reported	9,10 · 3.7 · Table 3
BPA recovery, disposable fast-food box, 25 uM spike	original none; added 25 uM; found 24.83 uM; HPLC 25.15 uM; RSD 4.4%; recovery 99.3%	—	RSD 4.4%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery, disposable fast-food box, 45 uM spike	original none; added 45 uM; found 43.70 uM; HPLC 45.02 uM; RSD 3.8%; recovery 97.1%	—	RSD 3.8%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery, disposable fast-food box, 5 uM spike	original none; added 5 uM; found 4.69 uM; HPLC 5.06 uM; RSD 3.8%; recovery 93.8%	—	RSD 3.8%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery, polycarbonate bottle, 25 uM spike	added 25 uM; found 25.37 uM; HPLC 25.52 uM; RSD 1.5%; recovery 98.6%	—	RSD 1.5%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery, polycarbonate bottle, 45 uM spike	added 45 uM; found 46.67 uM; HPLC 45.75 uM; RSD 0.4%; recovery 102.1%	—	RSD 0.4%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery, polycarbonate bottle, 5 uM spike	added 5 uM; found 5.59 uM; HPLC 5.80 uM; RSD 4.3%; recovery 97.5%	—	RSD 4.3%	Table Exact Reported	10 · 3.7 · Table 3
BPA recovery range in real samples	93.8-102.1%	—	n = 6; RSD below 4.5%	Table Range	10 · 3.7 · Table 3
BPS recovery, disposable fast-food box, 10 uM spike	original none; added 10 uM; found 9.87 uM; HPLC 9.80 uM; RSD 3.6%; recovery 98.7%	—	RSD 3.6%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery, disposable fast-food box, 20 uM spike	original none; added 20 uM; found 20.02 uM; HPLC 20.88 uM; RSD 3.3%; recovery 100.1%	—	RSD 3.3%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery, disposable fast-food box, 30 uM spike	original none; added 30 uM; found 28.8 uM; HPLC 29.90 uM; RSD 2.6%; recovery 96.0%	—	RSD 2.6%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery, polycarbonate bottle, 10 uM spike	added 10 uM; found 11.18 uM; HPLC 10.92 uM; RSD 0.1%; recovery 101.3%	—	RSD 0.1%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery, polycarbonate bottle, 20 uM spike	added 20 uM; found 20.49 uM; HPLC 20.50 uM; RSD 2.3%; recovery 97.2%	—	RSD 2.3%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery, polycarbonate bottle, 30 uM spike	added 30 uM; found 30.12 uM; HPLC 30.06 uM; RSD 1.7%; recovery 96.9%	—	RSD 1.7%	Table Exact Reported	10 · 3.7 · Table 3
BPS recovery range in real samples	96.0-101.3%	—	n = 6; RSD below 4.5%	Table Range	10 · 3.7 · Table 3

interference/selectivity test

Fe-HHTP/PGE · Electrode

10 uM BPA/BPS under optimised conditions; inorganic ions and phenolic analogues increased until relative deviation of Ip was below 5%; triplicate experiments.

Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor
Measurement source: 3,9 · 2.4; 3.6 · Table 2

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Cl- interference maximum concentration and relative deviation	1000 uM; relative deviation 3.2%	—	relative deviation 3.2%	Table Exact Reported	9 · 3.6 · Table 2
CO3 2- interference maximum concentration and relative deviation	1000 uM; relative deviation 2.5%	—	relative deviation 2.5%	Table Exact Reported	9 · 3.6 · Table 2
K+ interference maximum concentration and relative deviation	1000 uM; relative deviation 2.5%	—	relative deviation 2.5%	Table Exact Reported	9 · 3.6 · Table 2
Mg2+ interference maximum concentration and relative deviation	1000 uM; relative deviation 3.2%	—	relative deviation 3.2%	Table Exact Reported	9 · 3.6 · Table 2
Na+ interference maximum concentration and relative deviation	1000 uM; relative deviation 2.8%	—	relative deviation 2.8%	Table Exact Reported	9 · 3.6 · Table 2
NH4+ interference maximum concentration and relative deviation	1000 uM; relative deviation 2.7%	—	relative deviation 2.7%	Table Exact Reported	9 · 3.6 · Table 2
NO3- interference maximum concentration and relative deviation	1000 uM; relative deviation 2.8%	—	relative deviation 2.8%	Table Exact Reported	9 · 3.6 · Table 2
PNP interference maximum concentration and relative deviation	50 uM; relative deviation 3.3%	—	relative deviation 3.3%	Table Exact Reported	9 · 3.6 · Table 2
POP interference maximum concentration and relative deviation	50 uM; relative deviation 4.3%	—	relative deviation 4.3%	Table Exact Reported	9 · 3.6 · Table 2
SO4 2- interference maximum concentration and relative deviation	1000 uM; relative deviation 2.7%	—	relative deviation 2.7%	Table Exact Reported	9 · 3.6 · Table 2
TBBPA interference maximum concentration and relative deviation	50 uM; relative deviation 3.5%	—	relative deviation 3.5%	Table Exact Reported	9 · 3.6 · Table 2

storage stability and reproducibility test

Fe-HHTP/PGE · Electrode

12 Fe-HHTP/PGEs prepared; response measured on day 1 and day 35 after storage at 4 deg C; six electrodes used for known 10 uM BPA/BPS reproducibility.

Temperature: 277
Geometry: Fe-HHTP/PGE working electrode
Context: primary sensor
Measurement source: 4,9 · 2.4; 3.6

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
BPA reproducibility RSD	2.3%	—	six electrodes; 10 uM analyte	Text Exact Reported	9 · 3.6
BPS reproducibility RSD	4.0%	—	six electrodes; 10 uM analyte	Text Exact Reported	9 · 3.6
BPA response retention after 5 weeks at 4 deg C	95.6% of day-1 response	—	—	Text Exact Reported	9 · 3.6
BPS response retention after 5 weeks at 4 deg C	90.7% of day-1 response	—	—	Text Exact Reported	9 · 3.6