Помогите, пожалуйста, разобраться, что означает mt в следующей контексте:

У меня метод определения H2S в хвостовых газах установки производства серы на НПЗ. В пункте "Калибровка" есть такая фраза:

Starting from the standard sodium sulphide solution, make a dilute solution corresponding exactly to 7.14 microgram of S2- per ml, which is eqyuivalent to 0.005 ml hydrogen sulphide 0/760 per mt.

Что здесь может означать mt?

Заранее спасибо за любые варианты!

метрическая.

Арифметически: Background H 2 S air concentrations typically range between 0.11 ppb and 0.33 ppb, although concentrations in urban areas can be as high as 1 ppb. As expected, the closer one lives to sources of H 2 S emissions, the higher the background levels tend to be (and can exceed 90 ppb) [23]. According to the literature reviewed by the World Health Organization several years ago [39], yearly H 2 S emissions from all sources on land are from 53 to 100 million metric tons of sulfur, while oceanic emissions are between 27 and 150 million metric tons. Here we have also summarized source-based emission estimates for hydrogen sulfide as reported in the literature over the 10-year period 2004–14

https://www.abbreviationfinder.org/ru/acronyms/mt_metric-tonne.html

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