Test set for a photometric measuring device and photometric measuring method for a sample liquid

A photometric measuring method for a sample fluid (P) which is mixed with a first fluid (5) and second fluid (13), with the first fluid (5) being present in a sealed mixing container (1) and the second fluid being present in a dosing container (8), the hollow chamber (9) of which is sealed by a plug (10), including the following steps:

• taking the sample fluid (P) by means of a sample-taking device (21) fixed to the dosing container (8);
• opening of the mixing container (1);
• inserting the dosing container (8) into the mixing container (1), with the sample fluid (P) present in the sample-taking device (21) being introduced into the mixing container (1);
• mixing of the first fluid (5) with the sample fluid (P) by shaking the mixing container (1);
• introducing the second fluid (13) from the dosing container (8) into the mixing container (1), with pressure being exerted on the second fluid (13) and with the same being released together with the plug (10) into the first fluid (5);
• mixing of the first fluid (5), the sample fluid (P) and the second fluid (13);
• photometric measurement of the chemical reaction in an analyzer, and
• calculating the concentration of at least one sample ingredient.