26.1 µM in filtered, aqueous 0.003 M hydrochloric acid  plus 0.01 M acetic acid.  0.5 mL/ampoule  CRM-dcSTX-b is a calibration solution CRM designed  for use in chemical analysis methods. Each ampoule  contains 0.5 mL solution of decarbamoylsaxitoxin at a  concentration of 65 µM in 0.003 M hydrochloric  acid.0.5 mL/ampoule  1  CRM-GTX1&4-c is a certified calibration solution  designed for use in chemical analysis methods. Each  ampoule contains ~0.5 mL solution of a mixture of  gonyautoxin-1 (GTX1) at a concentration of 60.4 µM and  gonyautoxin-4 (GTX4) at a concentration of 19.7 µM in  0.003 M hydrochloric acid plus 0.01 M acetic  acid.0.5 mL/ampoule  1  CRM-GTX2&3-c is a certified calibration solution  designed for use in chemical analysis methods. Each  ampoule contains ~0.5 mL solution of a mixture of  gonyautoxin-2 (GTX2) at a concentration of 114.2 µM  and gonyautoxin-3 (GTX3) at a concentration of 43.4 µM  in 0.003 M hydrochloric acid plus 0.01 M acetic acid.  0.5 mL/ampoule  1  CRM-GTX5-c is a certified calibration solution designed  for use in chemical analysis methods. Each ampoule  contains ~0.5 mL solution of gonyautoxin-5 (GTX5, aka  B1) at a concentration of 55.7 μM in filtered, aqueous  acetic acid (17 μM, pH 5). 0.5 mL/ampoule  1  CRM-NEO-c is a certified calibration solution designed  for use in chemical analysis methods. Each ampoule  contains ~0.5 mL solution of neosaxitoxin (NEO) at a  concentration of 65.6 µM in 0.003 M hydrochloric  acid.0.5 mL/ampoule  1  CRM-STX-f is a certified calibration solution for use in  chemical analysis methods. Each ampoule contains  ~0.5 mL of a solution of saxitoxin (STX) dissolved in  1  EN-c4f_annexiitechspeciiitechoffer_en.docx August 2020 EN-c4f_annexiitechspeciiitechoffer_en.docx  Page 22 of 76 