Gs gaspro capillary column

Gas-phase concentrations were measured with a gas chromatograph (Shimadzu GC-2010, Japan) equipped with an FPD detector. The column used was a GS-Gas Pro capillary column (30 m × 0.32 mm × 1.0 μm, Agilent Technologies, USA). Gas samples were taken using Tedlar bags of 2 L. Total volume of 100 μL was injected into the GC using a gastight syringe. The injector and detector temperature were set at 70 °C and 250 °C, respectively. The GC oven temperature was programmed as follows: initial temperature of 80 °C for 2 min, increase to 250 °C at 10 °C min^− 1 and maintain for 5 min.
Macro-kinetic model was used to evaluate the elimination capacities (ECs) of each BTF. The ECs commonly follow a behavior that can be adequately described by a Michaelis-Menten model type [36 (link)]. This model is constructed based on ECs and is relatively simple and useful in predicting the removal performance of practical engineering.
$$\mathrm{EC}={\mathrm{EC}}_{\max }\frac{\mathrm{Cln}}{\mathrm{Ks}+\mathrm{Cln}}$$
Where EC_max (g.m³/h) is the maximum elimination capacity, Cln (g/m³) is the logarithmic average of the inlet and outlet concentrations of pollutants in the gas phase and Ks (g/m³) is the saturation constant.

The pH of the nutrient solution was measured on-line using a pH-meter. To determine the pH of the different layers of the BTFs bed, before each transient experiment, triplicate samples of the packing were taken from the each sampling site using a sterile tweezers, mixed with 3 mL of sterile water, and centrifuged at 7000 rpm for 10 min; the supernatants were analyzed with the pH-meter, and the pellets were used to measure the biomass. The biomass concentration was quantified based on the total protein measurement using the Bradford method. Sulfate, thiosulfate, nitrate and nitrite were analyzed using an ion chromatograph (Dionex ICS-1500, USA) with an AS19/AG19 column (Dionex, USA).
To analyze the H₂S concentration, gas samples were collected in 2 L Tedlar bags, and immediately analyzed with a gas chromatograph (Shimadzu GC-2010, Japan) equipped with an FPD detector. The air was separated by a GS-GasPro capillary column (30 m × 0.32 mm × 1.0 μm, Agilent Technologies, USA) with nitrogen as the carrier gas at a flow rate of 1.5 mL/min. The injector and detector temperature were 70°C and 250°C, respectively. The GC oven temperature was programmed as follows: initial temperature of 80°C for 2 min, increase to 250°C at 10°C min⁻¹ and maintain for 5 min.