The experimental parameters were as follows: microwave power 2 mW, microwave frequency 9.73 GHz, modulation amplitude 0.2 mT, time constant 82 ms and scan rate 2.1 G/s.
Under optimized conditions by pulse differential voltammetry (pulse amplitude of 100 mV, pulse time of 25 ms and scan rate of 10 mV s−1) and measures in 0.15 mol L−1 H2SO4, the proposed method successfully enabled the simultaneous determination of TBHQ and butylated hydroxyanisole (BHA), yielding limits of detection of 0.85 and 0.50 μmol L−1, respectively.
Common pesticides such as parathion methyl, parathion ethyl, azinphos methyl and coumaphos were investigated using a carbon fibre microelectrode with optimized DPV conditions as follows: scan rate, 40 m V/s; pulse width, 12.5 ms; pulse amplitude, 100 ms and scan increment, 4 mV.
The parameters are field of view = 120 mm, base resolution = 384 × 384, slice thickness = 1.5 mm, multiple echo times = 20, 40, 60, 80, 100, 120, and 140 ms, repetition time = 2000 ms, and scan time = 13 min. T 2 relaxation rates were plotted against iron concentrations in the particle dilutions.
For ·OH adduct, spectrometer parameters were: modulation frequency, 100 kHz; scan range, 100 G; field set, 350 G; microwave power, 10 mW; modulation amplitude, 1 G; time constant, 5 ms; and scan time 5.14 s.
A spin-echo echo-planar imaging sequence was applied to acquire DWI images, with the following parameters: repetition time (TR) = 10500 ms, echo time (TE) = 99.3 ms, number of averages = 1, slice thickness = 4 mm, field of view (FOV) = 256 mm × 256 mm, matrix = 128 × 128, gradient length = 30.9 ms, diffusion gradient = 39.1 ms, and scan time = 557 s.
For MS1, 10E6 ions were accumulated in the Orbitrap cell over a maximum time of 300 ms and scanned at a resolution of 30,000 (120,000 for Elite) FWHM (at 400 m/z).
Each spectrum was collected with an exposure time of 1 ms and scanned 500 times for averaging in order to improve the signal-to-noise ratio of each UV vis spectroscopic measurement.
For MS1, 10 ions were accumulated in the ICR cell over a maximum time of 500 ms and scanned at a resolution of 100,000 full-width at half-maximum nominal resolution settings.
The scan range was m/z 50 1500, the maximum injection time was 50 ms, and two scan events were prescribed to run sequentially in the mass spectrometer.
Quantification of FAMEs (C-14 0, C-14 0 and C-16:0) wandaC-18 0d C-18 0 mode wash the sachievedondinions with collision energy of 30 eV and a solvent delay of 5 MRM. The dwell timodeas 50 ms and the scan rate with6.5 cycles/s.
