Table 1 Search terms and number of results based on search engine

Microplastic* AND hyperspectral

140

17

56

Microplastic* AND (“imaging spectroscopy” OR “spectral imaging”)

50

6

22

(macroplastic* OR “plastic litter” OR “plastic debris”) AND hyperspectral

98

12

41

(macroplastic* OR “plastic litter” OR “plastic debris”) AND (“imaging spectroscopy” OR “spectral imaging”)

35

3

16