The phrase "added as standard" is correct and usable in written English.
It is typically used to indicate that a particular feature or item is included as a regular part of a product or service without any additional cost.
Example: "The new model comes with a rearview camera added as standard, enhancing safety for all drivers."
Alternatives: "included by default" or "provided as a standard feature".
We advise that D. officinale from traditional producing locations, such as Zhejiang provinces or the Danxia landform area, should be added as standard medicinal references.
Although lymphadenectomy was only recently added as standard surgical approach, lymph node status seems to be the most important pathological risk factor for recurrence, as demonstrated in several studies [ 11, 15, 17, 33].
Stable isotope-labeled standard compounds were purchased from OlChemim Ltd. (Olomouc, Czech Republic) and added as standards in runs at known concentrations to allow for absolute quantification of plant hormones in these samples.
To each flask, 8 μg/mL (final concentration) of FUR standard solution was added as internal standard.
As an additional control, defined numbers of the standard fragment were added as internal standards to the cell extract and it was verified that the analysis led to the quantification of the added number of molecules.
Retinal was added as internal standard because of its intermediate polarity.
FAME samples were dissolved in hexane with C17:0 added as internal standard.
Pyrogallic acid was added to prevent oxidative degradation of fatty acids during acid hydrolysis while triundecanoin was added as internal standard.
For the analysis, samples were diluted (1 2) with 1% (v/v) hydrochloric acid and iridium was added as internal standard (final concentration 5 µg mL−1).
Kinetic measurements of the formation of a coloured formazan derivative was used after nutrient broth addition to estimate initial cell concentrations by reference to Escherichia coli added as internal standard.
Heptadecanoic acid (C17:0) was added as internal standard at the beginning of the lipid extraction process.
