Final answer:
The first step in the Jendrassik-Grof Method for analyzing total bilirubin uses tartaric acid as an accelerator.
Step-by-step explanation:
The first step in the Jendrassik-Grof Method for total bilirubin analysis uses tartaric acid as an accelerator along with bilirubin and diazo. Tartaric acid helps to enhance the reaction and improve the accuracy of the analysis.