試劑二：用前一天，向試劑二中加2 mL蒸餾水充分溶解，再加磷酸0.5 mL，混勻后蓋緊（防止水分散失）沸水浴2h；冷卻后加8 mL蒸餾水，2-8℃可保存2周。（一瓶即可做100T，為延長試劑盒使用時間，故多給一瓶）

標(biāo)準(zhǔn)品：10 mg半*氨酸。將標(biāo)準(zhǔn)品加入4.13mL蒸餾水，可得到20μmol/mL的標(biāo)準(zhǔn)液。2-8℃可以保存4周。

Huang Q, Wang M, Xia Z. The SULTR gene family in maize (Zea mays L.): gene cloning and expression analyses under sulfate starvation and abiotic stress[J]. Journal of plant physiology, 2018, 220: 24-33.

Yansha Han,Mengyang Wu,Lihong Hao,et al. Sulfur dioxide derivatives alleviate cadmium toxicity by enhancing antioxidant defence and reducing Cd²⁺ uptake and translocation in foxtail millet seedlings. Ecotoxicology and Environmental Safety. August 2018;(IF4.527)