After finishing her degree in natural sciences, Poplin trained as a pharmacist, qualifying in 1887, and opened a pharmacy on Brussel’s rue Notre-Dame-au-Bois.[1][2]
Popelin and her sister Marie are regarded as the “first feminists in Belgium”. Marie was the first Belgium woman to earn a Doctor of Laws, but was refused entry to the bar. The Popelin sisters founded the Belgian League for Women’s Rights (Ligue du droit des femmes), seeking political, economic and civil equality of women, in 1892.[2][3] Popelin represented the League at the 1909 International Council of Women in Toronto.[2]
Popelin died in 1937.[2] A room in the campus of the ULB is named after her.[4]