Standard for Semi-quantitative Method - 7 components: K 1000mg/l Ag 100mg/l Al 100mg/l B 100mg/l Ba 100mg/l Na 100mg/l Si 50mg/l in HNO3 5%/tr HF ,, CRM, ISO 17034 and ISO 17025 Conservation 36 months. Store under normal laboratory condit 1 * 100 mL